After storming the beaches on D-Day, June 6, 1944, the Allied invasion of France bogged down in seven weeks of grueling attrition in Normandy. On July 25, U.S. divisions under Gen. Omar Bradley launched Operation Cobra, an attempt to break out of the hedgerows and begin a war of movement against the Germans. Despite a disastrous start, with misdropped bombs killing more than 100 GIs, Cobra proved to be one of the most pivotal battles of World War II, successfully breaking the stalemate in Normandy and clearing a path into the heart of France.