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Operation Atlantic

Operation Atlantic was a major Canadian offensive launched during the Battle of in the Second World War, taking place from 18 to 21 July 1944 as part of the broader Allied . The operation involved the debut of the II Canadian Corps and the 2nd Canadian Infantry Division in , with the primary objectives of capturing the southern outskirts of , securing the industrial area of Colombelles, and advancing to Verrières Ridge to outflank defenses eastward. Supported by nearly 1,300 tanks from General Miles Dempsey's British Second Army, Canadian forces—primarily from the 3rd Canadian Infantry Division in the initial phase—faced stiff resistance from elements of four panzer divisions, including the and the 1st SS Panzer Division Leibstandarte SS . The offensive began concurrently with the British-led on 18 July, following extensive aerial bombardment that neutralized much of the German artillery. In the first phase, the 3rd Canadian Infantry Division successfully cleared German positions east and south of , capturing key industrial zones and taking over 600 prisoners while inflicting significant enemy casualties, at a cost of 386 Canadian soldiers (86 killed). However, the subsequent assault by the 2nd Canadian Infantry Division on 21 July against the heavily fortified Verrières Ridge failed to achieve a breakthrough, resulting in heavy losses as German counterattacks repelled the advance. Overall, Operation Atlantic incurred 1,349 to 1,614 Canadian casualties, including killed, wounded, and missing, but succeeded in diverting German armored reserves away from the western front, thereby facilitating the subsequent American on 25 July that broke the stalemate. Despite not fully attaining its territorial goals, the marked a critical step in the Allied campaign to liberate and demonstrated the integration of Canadian forces into the multinational effort under (SHAEF). It highlighted the intense urban and hedgerow fighting characteristic of the Normandy battles, where Canadian troops earned praise for their tenacity amid high attrition rates. The engagement also underscored the strategic coordination between British armored thrusts and Canadian infantry assaults, contributing to the gradual wearing down of German defenses in the region.

Background

Strategic Situation in Normandy

The Allied invasion of Normandy commenced on June 6, 1944, with D-Day landings that achieved initial successes, as British and Canadian forces under the 21st Army Group secured beachheads on Sword, Juno, and Gold beaches east of the Orne River, while American troops established positions to the west. However, these gains were quickly contested by German counterattacks, particularly from the 21st Panzer Division, which launched probes toward the invasion beaches and halted the British advance short of Caen, a key road hub only a few miles inland. By the end of D-Day, the Allies had linked their beachheads into a cohesive lodgment approximately 60 miles wide and 10 miles deep, but the failure to seize Caen as planned exposed vulnerabilities in the rapid expansion of the bridgehead. The strategic situation deteriorated into a stalemate as German forces, under Field Marshal Erwin Rommel's Army Group B, consolidated defenses around Caen, transforming it into a formidable anchor for their Normandy front. Rommel's pre-invasion strategy emphasized immediate counterattacks with armored reserves positioned close to the coast to defeat invaders on the beaches, but post-D-Day adaptations focused on holding key terrain, including fortified positions along the Orne River to contain the British bridgehead east of the city. Several elite Panzer divisions, including the 12th SS Panzer Division Hitlerjugend and the Panzer Lehr Division, reinforced the sector between June 7 and 12, creating a concentrated armored defense that pinned down Anglo-Canadian forces and prevented breakouts. The bocage terrain—dense hedgerows and sunken lanes enclosing small fields—further hindered British and Canadian advances by limiting visibility, restricting tank maneuverability, and favoring German ambushes, although the open plains nearer Caen allowed for more fluid armored engagements compared to the American sector. A critical early effort to outflank Caen, Operation Perch, launched on June 7, 1944, involved the British 30th Corps advancing southward to link with airborne troops east of the city, aiming to encircle and isolate German defenses. The operation faltered by June 13 after encounters with superior German armor, notably at the Battle of Villers-Bocage where Tiger tanks of the 101st SS Heavy Panzer Battalion repulsed the British 7th Armoured Division, resulting in heavy losses and the abandonment of the encirclement plan on June 14. This failure entrenched the stalemate, forcing prolonged urban and hedgerow fighting around Caen's northern suburbs and diverting German Panzers from countering American advances in the west, while underscoring the challenges of dislodging Rommel's riverine fortifications along the Orne.

Operation Overlord and the Battle for Caen

, the Allied invasion of launched on 6 June 1944, aimed to establish a secure lodgement area along a 50-mile front from near to Les Pieux near Grandcamp-Maisy, enabling the buildup of forces to liberate from Nazi occupation. The plan's initial phase involved airborne assaults by the U.S. 82nd and 101st Airborne Divisions and the British 6th Airborne Division, followed by amphibious landings of five seaborne divisions to secure beachheads, with an early push toward the port of for capture by D+14 to support logistics until artificial Mulberry harbors were fully operational. By D+90, the broader strategy sought to extend the bridgehead approximately 60 miles inland to the Seine River, clearing enemy forces and facilitating advances toward and beyond, though logistical constraints like supply lines from the beaches emphasized the need for rapid port seizures. Under General Bernard Montgomery's command of the 21st Army Group, forces were divided to exploit terrain and draw German attention: the British Second Army, which included Canadian units such as those of the II Canadian Corps, was assigned the eastern sector between Bayeux and Caen to capture the city and its surroundings, thereby attracting and pinning German armored reserves like the 21st Panzer Division. This role allowed U.S. First Army forces in the western sector to maneuver toward less defended areas for a potential breakout, with the 3rd Canadian Infantry Division landing on Juno Beach as part of the D-Day assault to link up with British airborne elements east of the Orne River and Caen Canal. The emphasis on Caen stemmed from its strategic position astride key roads and rail lines, offering airfield sites and serving as a hub for German reinforcements, thus making its capture essential to disrupt enemy mobility while protecting the Allied flank. The Battle for Caen evolved through a series of intense operations in June and July 1944, transitioning from initial D-Day failures to partial gains amid fierce German resistance from elite panzer units. Operation Epsom, launched by the British on 26 June, sought to outflank Caen southward along the Odon River but stalled against heavy counterattacks, creating a temporary salient without encircling the city. This was followed by Operation Windsor on 4-5 July, where Canadian forces captured the fortified village of Carpiquet and its airfield northwest of Caen, though at high cost due to entrenched German positions. Operations Charnwood (8-9 July) and Jupiter (10-11 July) then pushed forward: Charnwood, an Anglo-Canadian assault, secured northern Caen up to the Orne River, while Jupiter targeted Hill 112 south of the city, briefly holding it before German reinforcements forced a withdrawal. Operation Greenline on 15-17 July diverted enemy attention south of Caen but yielded limited territorial progress, leaving the southern half of the city—including industrial areas like Colombelles—firmly in German hands by mid-July. To support the Canadian-led push toward southern , was coordinated as a major British armored offensive east of the bridgehead starting 18 July 1944, involving VIII Corps' three armored divisions to seize the Bourguébus Ridge and draw additional German panzers away from the Canadian II Corps' efforts. This joint operation, dubbed "Atlantic" for the Canadian component, aimed to exploit Goodwood's pressure by advancing from the east, though heavy rains and German defenses limited breakthroughs to containing enemy forces and enabling subsequent U.S. operations like .

Planning and Preparation

Objectives and Operational Plan

Operation Atlantic was a Canadian offensive launched on 18 July 1944 as part of the broader during the campaign, with the primary objectives of capturing the southern half of —including key industrial areas such as Colombelles—to secure a and disrupt defenses, while also seizing Verrières Ridge to facilitate further Allied advances toward Falaise and support the overall breakout from . These goals aimed to fix forces in the east, preventing their redeployment to counter operations in the west, thereby enabling the encirclement of enemy positions. The operation was devised by Lieutenant-General , commander of II Canadian Corps, under the oversight of General Miles 's Second British Army and Field Marshal Bernard 's ; the plan was finalized by on 13 July and approved by on 15 July. The operational plan consisted of a three-phase assault designed to methodically break through fortified German lines south of Caen. In Phase I, forces would secure a bridgehead across the Orne River by capturing positions at Giberville, Colombelles, and Vaucelles, establishing a firm foothold east of the city. Phase II focused on clearing the southern districts of Caen, including the industrial suburbs and Faubourg-de-Vaucelles, to consolidate control over the urban area and repel initial counterattacks. Phase III involved an armored and infantry push to assault and secure Verrières Ridge, the high ground south of the city, providing observation and defensive advantages for subsequent operations toward Bourguébus Ridge and Falaise. This phased approach integrated the 2nd and 3rd Canadian Infantry Divisions, with Simonds emphasizing coordinated advances through wooded and built-up terrain to minimize exposure to German anti-tank defenses. Air and support played a pivotal role in softening German positions prior to the ground assault. Over 1,000 RAF heavy bombers, including Lancasters and Halifaxes from Bomber Command, conducted preliminary strikes on 18 July, dropping approximately 7,800 tons of bombs on targets around Colombelles and the Verrières heights to disorganize defenses and crater the landscape. This was supplemented by more than 2,000 total Allied aircraft sorties, with tactical support from No. 84 Group RAF fighter-bombers providing where weather permitted. On the ground, corps-level from Royal Canadian and British units fired over 250,000 shells in the opening barrages, while naval gunfire from HMS Rodney and accompanying cruisers targeted inland strongpoints along the and canal crossings. These combined efforts aimed to achieve superiority in , though heavy rain from 20 July onward limited further aerial operations.

Allied and Axis Forces Involved

The Allied effort in Operation Atlantic was spearheaded by the II Canadian Corps, under the command of Lieutenant-General , as part of Lieutenant-General Miles Dempsey's British Second Army. This corps comprised the 2nd Canadian Infantry Division, led by Major-General Charles Foulkes, and the 3rd Canadian Infantry Division, commanded by Major-General . Supporting armored elements included the , equipped primarily with tanks from regiments such as the Sherbrooke Fusiliers Regiment (27th Armoured Regiment). Key infantry units involved were the 4th Canadian Infantry Brigade (Brigadier Sherwood Lett), 5th Brigade (Brigadier W. J. Megill), 6th Brigade (Brigadier H. A. Young), 7th Brigade (Brigadier H. O. Dallison), 8th Brigade (Brigadier K. G. Blackader), and 9th Brigade (Brigadier J. M. Houghton), featuring regiments like the North Highlanders, , , of Canada, , South Saskatchewan Regiment, Les Fusiliers Mont-Royal, and Régiment de Maisonneuve. Aerial support was provided by Typhoon fighter-bombers for and interdiction. The Canadian forces totaled approximately 20,000 troops with over 300 tanks committed to the operation. On the Axis side, the primary defenders were elements of the I SS Panzer Corps, commanded by SS-Obergruppenführer Josef "Sepp" Dietrich, within Panzer Group West under General Heinrich Eberbach. The core opposing force was the 12th SS Panzer Division "Hitlerjugend," led by SS-Brigadeführer Kurt Meyer, which had been heavily engaged since the initial Normandy landings and was fatigued from prior battles around Caen; it initially fielded about 150 tanks but had lost 129 (including 44 Panzer IVs and 21 Panthers) by early July. Reinforcements included the 1st SS Panzer Division "Leibstandarte SS Adolf Hitler" (SS-Brigadeführer Theodor Wisch), 9th SS Panzer Division "Hohenstaufen," 21st Panzer Division, 2nd Panzer Division, and the 272nd Infantry Division (Generalmajor Fritz Schack), totaling roughly 15,000 troops with around 200 tanks. These units were deployed along a defensive line featuring the fortified Verrières Ridge, Bourguébus Ridge, and southern Caen approaches, bolstered by anti-tank guns (such as 88mm Pak 43s), extensive minefields, Nebelwerfer rocket launchers, and entrenched positions in villages like Fleury-sur-Orne and Colombelles. Logistically, the Canadians faced strained supply lines due to delays in port operations following storm damage to the Mulberry harbors in late June, limiting efficient delivery of ammunition and fuel despite rapid engineering efforts to bridge the Orne River. German reinforcements and resupply were further hampered by relentless Allied air interdiction campaigns, which targeted rail lines and roads leading to the Normandy front, preventing timely arrival of additional Panzer units from eastern reserves.

Execution of the Offensive

Initial Assault and Bombardment

Operation Atlantic commenced on the morning of 18 July 1944, with the 3rd Canadian Infantry Division crossing the Orne River to establish a bridgehead in the northeastern suburbs of Caen. Engineers from the 3rd Canadian Infantry Division, including the 29th and 31st Field Companies, constructed Bailey bridges under challenging conditions, including muddy banks, a three-meter tidal range, and six-meter-high banks, completing a Class 9 150-foot double-single Bailey bridge and a Class 40 crossing by the morning of 19 July. This crossing faced opposition from the 16th Luftwaffe Field Division, but Canadian forces secured the initial bridgehead despite heavy enemy artillery fire that delayed bridging efforts until late on 18 July. The assault was preceded by a massive aerial bombardment as part of the broader , in which approximately 1,600 aircraft from dropped 7,700 tons of bombs on German positions north of , targeting defenses held by the 16th Field Division and causing significant disruption to enemy artillery and . Over 250,000 artillery shells from naval and land batteries supplemented the air strikes, further weakening German forward positions, though the bombardment also led to incidents, with some shells striking Canadian troops during the advance. The 3rd Canadian Infantry Division's , supported by the , punched through the outer defenses following the barrage. Key early engagements included the capture of Giberville, where units such as the cleared the village by the evening of 18 July, taking hundreds of German prisoners from the 16th Field Division. Similarly, Cagny fell to combined Canadian and British armored elements, with the providing crucial support to overcome resistance from elements of the 12th SS Panzer Division positioned south of the area. These successes established a foothold for further advances, though the encountered immediate obstacles. The bombardment's dense smoke and dust severely obscured targets and landmarks, complicating navigation and coordination during the river crossing and initial push, which exacerbated the risks from and minefields. Despite these issues, the preparatory phase achieved its objective of disrupting defenses, allowing the 3rd Canadian Division to consolidate positions east of the by mid-afternoon on 18 July.

Advance into Southern Caen and Colombelles

Following the initial assault across the Orne River, the 3rd Canadian Infantry Division advanced into the urban and industrial zones of southern Caen on 18 July 1944, engaging in fierce house-to-house fighting to clear Vaucelles and the Faubourg de Vaucelles districts against remnants of the 12th SS Panzer Division. These areas, characterized by narrow streets, bombed-out buildings, and entrenched German positions, demanded close-quarters tactics as Canadian infantry advanced methodically, supported by limited armored elements navigating rubble-strewn terrain. The 8th and 9th Infantry Brigades led the effort, with units like the North Nova Scotia Highlanders and the Highland Light Infantry of Canada facing sporadic sniper fire and booby traps amid the ruins. A key objective in this phase was the capture of the Colombelles steelworks, a vital that supplied German forces with materials and served as a logistical hub. On 18 July, Le Régiment de la Chaudière and the North Shore Regiment, under covering fire from supporting tanks, assaulted the facility after preparatory artillery and air strikes softened defenses. The steelworks fell after hours of intense combat, with Canadian troops securing the site and disrupting enemy supply lines, thereby hampering reinforcements to the broader Caen front. This success marked a significant tactical gain, though the industrial area's destruction from prior bombings complicated consolidation. German responses included several failed counterattacks by Panther tanks from the 12th SS Panzer remnants, probing Canadian lines near Colombelles and Vaucelles in attempts to reclaim lost ground. These panzer thrusts, launched on 18 and 19 , were met with determined from Canadian anti-tank guns, including 17-pounders positioned in defensive strongpoints, which knocked out several vehicles at close range. RAF aircraft provided critical , strafing and rocketing the advancing tanks to break the momentum of the assaults, preventing any meaningful penetration. In the confined urban environment, Canadian forces employed tactical innovations such as flamethrower-equipped Wasp carriers to flush out holdouts in buildings and bunkers. These variants, armed with a 65-gallon fuel tank and projector, were integrated into platoons of the 3rd , delivering short bursts of up to 100 yards to support advances in Vaucelles and the steelworks perimeter. proved effective in neutralizing fortified positions without exposing troops to prolonged firefights, though their vulnerability to enemy fire required careful coordination with covering elements.

Results and Immediate Aftermath

Territorial Gains and Failures

During Operation Atlantic, from 18 to 21 July 1944, Allied forces achieved partial territorial gains by securing full control of southern Caen, including its key suburbs such as Colombelles, Giberville, Mondeville, Vaucelles, and Louvigny. The Canadian 3rd Infantry Division, supported by armored units, crossed the Orne River and captured the strategically vital Colombelles factories on 18 July, eliminating a major German industrial base in the area. These successes expanded Allied lines approximately 3-5 kilometers south of the Orne River, establishing secure bridgeheads that solidified positions east and southeast of Caen. However, the operation failed to achieve its primary objective of seizing Verrières Ridge, a dominant height south of essential for further advances. German reinforcements, particularly the 9th SS Panzer Division from the , arrived swiftly and bolstered defenses, leading to a stalled Canadian advance and heavy repulses on 20 July during assaults on positions like May-sur-Orne and Tilly-la-Campagne. The 9th SS Panzer Division's counterattacks, combined with entrenched anti-tank positions, prevented any breakthrough, resulting in only limited progress beyond the initial river crossings. These territorial changes shifted the front line from pre-offensive positions along the to a more defensible alignment astride Verrières Ridge, though the ridge itself remained in German hands. This adjustment, while modest, positioned Allied forces for subsequent operations, such as in late August, by denying the Germans unrestricted use of the high ground. The fighting also inflicted severe environmental damage, with cumulative Allied bombings and ground combat destroying approximately 73% of Caen's infrastructure; of the city's 15,000 pre-war buildings, only 1,000 remained intact by the operation's end.

Casualties and Material Losses

During Operation Atlantic, Canadian forces incurred heavy casualties, with official records indicating total personnel affected of 1,965, including 441 killed or died of wounds. Several hundred prisoners were taken, primarily on 18 and 19 , with enemy casualties significant but not precisely quantified in available reports. The also sustained notable armored losses in defensive actions around Verrières Ridge and Colombelles. Material losses further underscored the operation's intensity. Canadian units lost around 80 and more than 100 other vehicles to enemy fire and terrain challenges. On the German side, Allied air interdiction compounded ammunition shortages, severely hampering resupply efforts for the 12th SS Panzer Division and supporting elements. In comparison to preceding operations, Atlantic's casualty rate reflected higher intensity than Operation Charnwood (1,194 Canadian casualties) but fell short of the British losses in the concurrent Operation Goodwood (over 4,000).

Analysis and Legacy

Tactical and Operational Assessment

Operation Atlantic demonstrated notable strengths in the integration of air bombardment with ground forces during the initial phases of urban clearance around Caen. The heavy RAF bombing on 18 July 1944, involving over 1,000 aircraft dropping approximately 7,700 tons of bombs, effectively softened German defenses in Colombelles and Vaucelles, allowing the 3rd Canadian Infantry Division to cross the Orne River and secure key industrial areas by the end of the day. Infantry units, supported by elements of the 2nd Canadian Armoured Brigade, coordinated closely to clear strongpoints, with the North Nova Scotia Highlanders and Sherbrooke Fusilier Regiment advancing methodically through rubble-strewn terrain. Lieutenant-General Guy Simonds' aggressive leadership played a pivotal role, as he adapted plans on the fly—such as redirecting the 9th Infantry Brigade to exploit gaps—driving the corps forward despite logistical strains. However, significant weaknesses undermined the operation's broader objectives. Poor intelligence on German reserves, particularly the rapid commitment of the 1st SS Panzer and 12th SS Panzer Divisions, resulted in fierce counterattacks that halted the advance on Verrières Ridge on 20 . Inclement weather further exacerbated issues by grounding fighter-bombers, leaving infantry exposed without and exposing gaps in coordination, where armor often outpaced supporting artillery. In comparison to the concurrent , Atlantic achieved partial territorial gains similar to the British effort—securing the eastern flank of but failing to break through to open ground—yet it underscored Canadian forces' relative inexperience in large-scale operations, with higher proportional reflecting challenges in adapting to urban and hedgerow fighting. Total Canadian losses reached 1,965, including 441 fatalities, highlighting the operation's costly nature. Key lessons from Atlantic emphasized the need for rapid bridge-building across waterways like the to sustain momentum, as delays in engineering support limited exploitation of initial successes. It also stressed bolstering anti-tank defenses and intelligence on panzer reserves, influencing subsequent operations such as Tractable by prompting Simonds to incorporate armored personnel carriers and improved air-ground liaison to mitigate similar failures.

Strategic Impact on the Normandy Campaign

Operation Atlantic contributed significantly to the attrition of German armored forces in the Normandy campaign, particularly depleting the elite . By the conclusion of the operation on 21 July 1944, which formed the Canadian component of the broader British , the 12th SS had been reduced to approximately 50 combat-ready tanks from an initial strength of around 150, representing a loss of over 60% of its armored capability through intense engagements south of . This weakening forced the Germans to redeploy scarce reserves from other sectors, including elements from the Eastern Front, to bolster defenses around , thereby stretching their overall operational capacity across . The modest territorial gains achieved by II Canadian Corps during Atlantic—such as the capture of Faubourg de Vaucelles and a foothold on Verrières Ridge—pinned German panzer divisions in the eastern sector, creating opportunities for the Allied breakout. These positions facilitated the American on 25 July 1944, which shattered German lines west of , and enabled subsequent Canadian offensives including on 8 August and on 14 August. Together, these actions converged to form the by mid-August, encircling and destroying much of the German Seventh Army and Fifth Panzer Army, with over 100,000 German troops trapped or retreating through the narrowing gap. In Canadian military history, Operation Atlantic marked the combat debut of II Canadian Corps under Lieutenant-General , integrating the 2nd Canadian Division into the theater for the first time and elevating 's role in the multinational Allied effort. However, the operation highlighted persistent equipment shortages within Canadian units, including limited anti-tank capabilities and reliance on British-supplied armor, which constrained maneuverability against fortified German positions. Post-war evaluations by historians such as Terry Copp have characterized Operation Atlantic as a "costly but necessary" element of Bernard Montgomery's attritional strategy, which prioritized wearing down German forces through sustained pressure rather than seeking immediate decisive breakthroughs. While the offensive incurred heavy Canadian casualties—over 1,300 in four days—it succeeded in diverting and exhausting elite panzer units, setting the stage for the campaign's eventual success despite its tactical limitations.

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