Map: Caesar's Wall and Sections of Rhone Bed by T.A. Dodge

Map of the Rhone river territory through which the Helvetii attempted to travel until Caesar blocked their path with a wall (Caesar's Gallic War 1.6-8). From Theodore Ayrault Dodge, Caesar: A History of the Art of War Among the Romans Down to the End of the Roman Empire, with a Detailed Account of the Campaigns of Caius Julius Caesar (Boston: Houghton Mifflin, 1892), p. 61.