The US-manufactured Lewis gun replaced the Vickers as the standard machine gun of the British army in the First World War. This 1941 re-issue of an instruction manual first published in 1918 proves that the Lewis was still valued in the Second World War. The booklet opens with general instructions on how the gun is loaded, fed, fired, cooled and operated. There are chapters on stripping and assembling the gun, how to cope with stoppages and elementary drill.