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 five hundred thousand, with fronts stretching for hundreds of miles. And Western Europe was not even the main theater. That scale is something we cannot really conceive of today.
Much of the detail is brought through the correspondence between key figures: Eisenhower, Montgomery, and Bradley.