The Guns at Last Light by Rick Atkinson

This book is a military history of WWII in Western Europe, specifically from the Allied landing at Normandy in 1944 to VE Day in 1945.

Written by Pulitzer Prize winner Rick Atckinson, The Guns At Last Light impressed upon me the sheer scale of WWII. At its end, the Allies had 4.5 million soldiers in Europe. Some generals commanded groups of 500,000 soldiers, with fronts that stretched for hundreds of miles. The US armed forces consisted of 12 million people at its height, with Britain at 5 million. And Western Europe was not even the main theater.

Much of the detail is brought through the correspondence between key figures: Eisenhower, Montgomery, and Bradley.