In the spring of 1944, on the eastern front of India near the Burmese border, the seemingly unstoppable Imperial Japanese Army suffered the worst defeat in its history at the hands of Lieutenant General William Slim’s British XIV Army, most of whose units were drawn from the little-esteemed Indian Army. Triumph at Imphal-Kohima tells the largely unknown story of how an army that Winston Churchill had once dismissed as “a welter of lassitude and inefficiency” came to achieve such an unlikely, unprecedented, and critical victory for the Allied forces in World War II.