 By March 1945, the Allied armies had advanced into Germany and had reached the River Rhine. The Rhine was a formidable natural obstacle to the Allied advance, but if breached would allow the Allies to access the North German Plain and ultimately advance on Berlin and other major cities in Northern Germany. Following the "Broad Front Approach" laid out by General Dwight David Eisenhower, the Supreme Allied Commander of the Allied Expeditionary Force, it was decided to attempt to breach the Rhine in several areas. Field Marshal Sir Bernard Montgomery, commanding the Anglo-Canadian 21st Army Group, devised a plan, code-named Operation Plunder, that would allow the forces under his command to breach the Rhine, which was subsequently authorized by Eisenhower. Plunder envisioned the British Second Army, under Lieutenant-General Miles C. Dempsey, and the U.S. Ninth Army, under Lieutenant General William Simpson, crossing the Rhine at Rees, Wesel, and an area south of the Lippe Canal.
