His comrades called him "Killer." Of the elite paratroopers who served in the venerated "Band of Brothers" during World War II, none were more enigmatic than Ronald Speirs. Rumored to have gunned down enemy prisoners and even one of his own disobedient sergeants, Speirs' became a foxhole legend amongst his troops. But who was the real Lieutenant Speirs? In Fierce Valor, historians Jared Frederick and Erik Dorr unveil the full story of Easy Company's longest-serving commander for the first time. Tested by trials of extreme training, military rivalry, and lost love, Speirs's international odyssey begins as an immigrant child in Prohibition-era Boston, continues through the bloody campaigns in France, Holland, and Germany, and sheds light on his lesser known exploits in Korea, the Cold War, and embattled Laos. Packed with groundbreaking research, Fierce Valor unveils a compelling portrait of an officer defined by boldness on the battlefield and a telling reminder that few soldiers escape the power of their own pasts.