sentences:  In 1916, the Post Office Rifles, the Princess Louise's Kensington Regiment and 19th Battalion, London Regiment (St Pancras) had been attached to the Middlesex Regiment from the territorial London Regiment, but retained their original titles and distinctions.In 1935 the Post Office Rifles and 19th Londons became searchlight regiments, and in 1937 The Kensingtons formally became a territorial battalion of the Middlesex Regiment.In 1938 the two territorial battalions formed duplicates, thus forming the 1/7th, 2/7th, 1/8th and 2/8th battalions.