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He initially joined the Madras Lancers, then transferred to the 23rd Cavalry a frontier force regiment.
Ch.Muhammad Sarwar Khan's grandfather Hashim Khan also served in the British Indian army during World War I in "58th Vaughan's Rifles (Frontier Force)" regiment and was awarded the Highest "Medal of Gallantry" during his service with Lord Kitchener in the Third Anglo-Afghan War.
After World War I the infantry element was incorporated in the 12th Frontier Force Regiment and the Guides Cavalry formed a separate regiment - the 10th Queen Victoria's Own Corps of Guides Cavalry (Frontier Force).
In 1939 the 1/12th Frontier Force Rifles were part of the Bannu Brigade based in Bannu India and took part in operations in the Ahmedzai Salient in February and March 1940 while under command of the Jhelum Brigade.
Harper dedicated the single to the memory of Ali Hader VC, of the 6th/13th Frontier Force Rifles, Indian Army (Pakistan).
He took part in the action at Fort Gamaizah (near Suakin), and served with the Nile Frontier Force in 1889 winning the Order of Medjidie Third Class.