<Li> Hundred Days <Ul> <Li> Amiens </Li> </Ul> </Li> <Ul> <Li> Amiens </Li> </Ul> <P> The Battle of Vimy Ridge was 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 four divisions of the Canadian Corps in the First Army, against three divisions of the German 6th Army . The battle took place from 9 to 12 April 1917 at the beginning of the Battle of Arras, the first attack of the Nivelle Offensive, which was intended to attract German reserves from the French, before their attempt at a decisive offensive on the Aisne and the Chemin des Dames ridge further south . </P> <P> The Canadian Corps was to capture the German - held high ground of Vimy Ridge, an escarpment on the northern flank of the Arras front . This would protect the First Army and the Third Army farther south from German enfilade fire . Supported by a creeping barrage, the Canadian Corps captured most of the ridge during the first day of the attack . The village of Thélus fell during the second day, as did the crest of the ridge, once the Canadian Corps overran a salient against considerable German resistance . The final objective, a fortified knoll located outside the village of Givenchy - en - Gohelle, fell to the Canadians on 12 April . The 6th Army then retreated to the Oppy--Méricourt line . </P>

When did the battle of vimy ridge happen