 in 1915 the wagon and truck aspect of the business had grown to the point that the company opened a subsidiary company in Shrewsbury as the Sentinel Waggon Works, manufacturing lorries and railway vehicles.A group of the core Scottish staff moved from Glasgow to Shrewsbury.In 1918 the company was acquired by William Beardmore & Co., Ltd, and opened another subsidiary, The Sentinel Valve Works, in Worcester, England, to expand its manufacture of valves.