 Most the Congress working committee including, Nehru, Abdul Kalam Azad, Sardar Patel were incarcerated at the Ahmednagar Fort until 15 June 1945.During the period where all of the Congress leadership were in jail, the Muslim League under Jinnah grew in power.In April 1943, the League captured the governments of Bengal and, a month later, that of the North West Frontier Province.