MS PAN of Canadian and British engineers building temporary bridge over Somme River. MLS of destroyed bridge over Somme River in attempt to flood surrounding country. People and vehicles are seen crossing remains of bridge. HA PAN of battalion of British soldiers working on bridge and roads reconstruction. Shots of explosions as engineers blow up obstructions in Somme River. MLS PAN of fruit trees deliberately cut down by retreating German soldiers. MS of two soldiers entering tunnel, PAN over road (army trucks visible) to other side showing soldiers coming out of tunnel from trapdoor on the ground and TILT UP as one soldier climb tree to former German observation post. [Titles interspersed]