The Battle of Atgram Complex, fought on 21 November 1971 between the 5 Gorkha Rifles of the Indian Army and the 31 Punjabs of the Pakistan Army, was one of the first engagements between the two opposing forces that preceded the formal initiation of hostilities of the Indo-Pakistani War of 1971, and also one of the first large scale assaults launched by the Indian army against East Pakistani forces preluding to the 1971 war.