Operation Atlantic was a Canadian offensive during the Battle of Normandy; launched in conjunction with Operation Goodwood, from July 18–20, 1944. Although initially successful, with gains made on the flanks of the Orne River near Saint-André-sur-Orne, an attack by the 4th & 6th Canadian Infantry Brigades against strongly defended positions on Verrières Ridge resulted in heavy casualties and limited strategic gain.
(Source: Wikipedia)More World War II Resources:
http://www.everythingworldwar2.com