By Arve Robert Pisani On June 6, 1944, Allied forces launched the greatest invasion in history against Nazi-occupied Europe. More than 150,000 troops landed on the coast of France as part of Operation Overlord, and for seven weeks they fought inland across fifteen miles of le bocage—the deadly maze of hedgerows, fields, and woodlands that comprises the Norman countryside. On July 25, they finally broke Germany’s defensive line with a…