Summary: Army Instructional film on the role of the Royal Engineers during the Second World War. The film begins with a brief summary of the history of military engineering, from the middle ages to the Crimea, Boer War and First World War. There is then a description of the engineers' organisation in combat, including mention of various specialist units, before moving on to specific examples of tasks carried out during the war. The clearing of obstacles and mines from landing beaches is shown in Normandy and Borneo, followed by scenes of the Mulberry harbour in operation at Arromanches. Crossings of the Seine, Rhine, Chindwin and Po rivers are shown by bridge, boat and amphibious vehicle. Winston Churchill and Field Marshal Montgomery are shown watching the Rhine crossing, and General Eisenhower appears briefly watching road construction. Airfield and railway construction also feature, as does minelaying, the destruction of military facilities in Norway and the demolition of U-Boat pens in Hamburg. The film ends with further scenes of the crossing of the Rhine in 1945, followed by an attack on prepared positions on the far side by Churchill tanks, including various specialised engineer vehicles, and infantry.