The men who flew American heavy bombers over Europe in World War II were very young—most were either in their late teens or early twenties. There they faced a gauntlet of razor sharp antiaircraft artillery bursts and fighter aircraft firing cannons that shattered Plexiglas, metal, engines, and bone. It is no wonder that bomber crews suffered some of the highest casualty rates of any service during the war. Yet, their courage and sacrifice would help the Allies secure an overwhelming victory over Hitler's Germany. That bravery and the extreme dangers these young men faced in combat over Europe are vividly portrayed in The Cruel Sky. Using the 451st Bombardment Group (Heavy) of the Fifteenth Air Force as the focus for this compelling narrative, author Robert Thompson describes how the bomber group was established and trained, what is took to fly its aircraft—the Consolidated B-24 Liberator—the opposition they faced, and the harrowing stories of the missions for which the group received three Distinguished Unit Citations, one of only two units so honored during World War II. Relying on official reports and firsthand accounts of those who flew with the 451st, the book provides a fresh and personal perspective of the deadly air war over Europe that was critical in defeating the Nazis and liberating millions.