 On 18 July, the British I Corps conducted an advance to secure a series of villages and the eastern flank of VIII Corps and to the west, the II Canadian Corps launched Operation Atlantic, synchronised with Goodwood, to capture the rest of Caen south of the Orne River.When Operation Goodwood ended on 20 July, the armoured divisions had broken through the outer German defences and advanced but had been stopped short of Bourguébus Ridge, only armoured cars having penetrated further south and beyond the ridge.While Goodwood failed in its primary aim, it forced the Germans to keep powerful formations opposite the British and Canadians on the eastern flank of the Normandy beachhead and Operation Cobra, the First US Army attack which began on 25 July, caused the weaker German defences opposite to collapse.