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The Battle of Vimy Ridge was a military engagement fought primarily as part of the Battle of Arras, in the Nord-Pas-de-Calais region of France, during the First World War. The main combatants were the Canadian Corps, of four divisions, against three divisions of the German Sixth Army. The battle, which took place from 9 to 12 April 1917, was part of the opening phase of the British-led Battle of Arras, a diversionary attack for the French Nivelle Offensive.
The objective of the Canadian Corps was to take control of the German-held high ground along an escarpment at the northernmost end of the Arras Offensive. Supported by a creeping barrage, the Canadian Corps captured most of the ridge during the first day of the attack. The town of Thélus fell during the second day of the attack, as did the crest of the ridge once the Canadian Corps overcame a salient of considerable German resistance. The final objective, a fortified knoll located outside the town of Givenchy-en-Gohelle, fell to the Canadian Corps on 12 April. The German forces then retreated to the Oppy–Méricourt line.
Historians attribute the success of the Canadian Corps in capturing the ridge to a mixture of technical and tactical innovation, meticulous planning, powerful artillery support and extensive training, as well as the failure of the German Sixth Army to properly apply the new German defensive doctrine. A 100 ha (250 acres) portion of the former battleground serves as a preserved memorial park and site of the Canadian National Vimy Memorial.