After the First World War, the 52nd Sikhs were grouped with the 51st, 53rd and 54th Sikhs, and the two battalions of Guides Infantry to form the 12th Frontier Force Regiment in 1922. The 52nd Sikhs became 2nd Battalion (Sikhs) of the new regiment. During the Second World War, 2 FF fought with distinction in the Malayan Campaign, where its Commanding Officer Lieutenant Colonel Arthur Edward Cumming, was awarded the Victoria Cross for outstanding valour. The battalion was captured by the Japanese after the British surrender at Singapore in February 1942. It was re-raised in 1946. In 1947, the Frontier Force Regiment was allotted to Pakistan Army. 2 FF was back in action in 1948, when it fought in the Kashmir War against India. In 1956, the Frontier Force Rifles and the Pathan Regiment were merged with the Frontier Force Regiment, and 2 FF was redesignated as 4 FF. During the Indo-Pakistan War of 1965, the battalion fought in the Sialkot Sector, while during the Indo-Pakistan War of 1971, it fought with great courage in the Battle of Hilli in East Pakistan. For exceptional valour, Major Muhammad Akram and Major Shabbir Sharif were awarded the Nishan-i-Haider, Pakistan's highest gallantry award.