 This required a huge influx of labour, and 30,000 men and women came from all over the British Commonwealth to serve as construction and factory workers.Sir Raymond Unwin, Chief Housing Architect of the housing branch of the Explosives Department of Ministry of Munitions, designed wooden housing for the workers in both Eastriggs and Gretna.As a mark of respect for the immigrant workforce, the streets were named after various cities within the Commonwealth.