'Battle of the Somme', First World War, July 1916, (c1920). Map of northern France showing 'Successive Stages of Advance at the Fricourt Salient...British line in black, Enemy Defences [Germans] in red'. Also indicated are trenches, 'wire entanglement' and craters. From "The Great World War: A History", Volume VI, edited by Frank A Mumby. [The Gresham Publishing Company Ltd, London, c1920]