The Battle of Hilli or the Battle of Bogura was a major battle fought in the Bangladesh Liberation War. It is generally regarded as the most severe pitched battle that took place in East Pakistan, now Bangladesh. The battle of Hilli took place between 23 November 1971 and 11 December 1971, although the final surrender took place on 18 December 1971.
The main objective of the Indian Army was to control Bogura, thereby cutting off Pakistan forces in the north from the rest of East Pakistan. The best way of getting to Bogura was through Hilli. The frontal assault on the Pakistan fortifications took a huge toll on both sides before Indian forces finally broke through by establishing a block in the rear of Pakistani forces in Hilli, upon which the 4FF Battalion in Hilli withdrew for the defence of Bogura.