Bangladesh was divided into eleven sectors in July, each with a commander chosen from defected officers of the Pakistani army who joined the Mukti Bahini to conduct guerrilla operations and train fighters. Most of their training camps were situated near the border area and were operated with assistance from India. The 10th Sector was directly placed under the Commander in Chief (C-in-C) General M. A. G. Osmani and included the Naval Commandos and C-in-C's special force. Three brigades (11 Battalions) were raised for conventional warfare; a large guerrilla force (estimated at 100,000) was trained.