D-Day, June 6, 1944, and the 76 days of bitter fighting in Normandy that followed the Allied landing, have become the defining episode of World War II in the west - the object of books, films, television series, and documentaries. Yet as familiar as it is, as James Holland makes clear in his definitive history, many parts of the OVERLORD campaign, as it was known, are still shrouded in myth and assumed knowledge.

During the third week of February 1944, the combined Allied air forces based in Britain and Italy launched their first round-the-clock bomber offensive against Germany. Their goal: to smash the main factories and production centers of the Luftwaffe while also drawing German planes into an aerial battle of attrition to neutralize the Luftwaffe as a fighting force prior to the cross-channel invasion, planned for a few months later. Officially called Operation ARGUMENT, this aerial offensive quickly became known as “Big Week,” and it was one of the turning-points of World War II.

For Americans, World War II began in December of 1941, with the bombing of Pearl Harbor; but for Poland, the war began on September 1, 1939, when Hitler's soldiers invaded, followed later that month by Stalin's Red Army. The conflict that followed saw the debut of many of the features that would come to define the later war-blitzkrieg, the targeting of civilians, ethnic cleansing, and indiscriminate aerial bombing-yet it is routinely overlooked by historians.

In February 1944, in one of the most astonishing battles of World War II, a ragtag collection of British clerks, drivers, doctors, muleteers, and other base troops, stiffened by a few dogged Yorkshiremen and a handful of tank crews, managed to defeat a much larger and sophisticated contingent of some of the finest infantry in the Japanese army on their march toward India.

One of the last cavalry units to ride horses into battle, the Sherwood Rangers were transformed into a “mechanized cavalry” of tanks in 1942. After winning acclaim in the North African campaign, they spearheaded one of the D-Day landings in Normandy and became the first British troops to cross into Germany. Their courage, skill, and tenacity contributed mightily to the surrender of Germany in 1945.