 His detailed plans, code-named Operation Plunder, were comparable to the Normandy invasion in terms of numbers of men and extent of equipment, supplies, and ammunition to be used.The 21st Army Group had 30 full-strength divisions, 11 each in the British 2nd and U.S. 9th Armies and eight in the Canadian 1st Army, providing Montgomery with more than 1,250,000 men.Plunder called for the 2nd Army to cross at three locations along the 21st Army Group front—at Rees, Xanten and Rheinberg.