'A breakthrough has occurred near Caen the like of which we have never seen.' This stark assessment, made by a senior German officer on the evening of 8th August 1944, was the German reaction to Operation Totalize, the Canadian attack planned and led by General Guy Simonds that threatened to trap the German army. Handsomely illustrated with maps, photographs and specially commissioned graphics of armoured vehicles and weapons, this major work is the first new study of a key Canadian operation in Normandy to appear for many years that is based on original research in primary sources.