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Fall Martin ("Case Martin") was a plan created by Field Marshal Gerd von Rundstedt in late 1944 during World War II. The plan envisaged a two-pronged attack aimed at the Allied forces in eastern Belgium and Luxembourg.
Von Rundstedt created Martin as a less-ambitious alternative to Wacht am Rhein, Adolf Hitler's plan to seize Antwerp and bottle up all Allied forces in Belgium and the Netherlands. Field Marshal Walter Model commanding Army Group B had devised a similar plan, Operation Herbstnebel, and he and Rundstedt combined their plans to present a joint "small solution" to Hitler. It was rejected, and the "big solution" went ahead, leading to the Battle of the Bulge.