 By 23 August , the remainder of the Wehrmacht 's Seventh Army had entrenched itself along the Seine River , in preparation for the defence of Paris . Simultaneously , elements of Army Group G — including the German 15th Army and the 5th Panzer Army — moved to engage American forces in the south . In the following week , elements of the Canadian 1st Army repeatedly attacked these German units on the Seine in attempts to break through to the Channel Ports . On the evening of 23 August , French and American Army units entered Paris . 
