Book excerpt: For 123 days in the summer of 1940, 3,000 youthful airmen in the Royal Air Force fought back against Hitler’s advancing forces with a heroism that astonished the world. Drawing on interviews with scores of surviving pilots as well as diaries and letters never before seen, military historian and journalist Patrick Bishop re-creates with astonishing intimacy and clarity this excruciating, exhilarating war of nerves. In their own words, the pilots describe what it was like to bale out from a stricken plane, to go into battle in the face of overwhelming odds, to hear the screams of a comrade as he went down in flames. With a riveting, taut narrative, Fighter Boys relates how those young heroes changed the course of World War II—and the history of the modern world.