I Corps is a military field formation of the Indian Army. The Corps is headquartered at Mathura in Uttar Pradesh. It was raised on 1 April 1965. It was still being raised when it was despatched to the front in 1965. Raised as the First Strike Corps of the Indian Army, it was launched into operations in the Sialkot sector. The Corps conducted a counteroffensive during the Indo-Pakistani War of 1965. In the 1971 war against Pakistan, it took part in the Battle of Basantar.