Why was the Battle of the Bulge Germany's last major offensive on the Western Front?

The Battle of the Bulge (December 16, 1944–January 16, 1945) was Germany’s last major offensive on the Western Front because it exhausted the nation's remaining military strength and resources.12

In a desperate attempt to turn the tide, Hitler concentrated his final battleworthy units and reserves—including forces raised through a "total mobilization"—to strike through the Ardennes with the goal of reaching Antwerp and cutting off Allied supplies. While the surprise attack initially caused significant damage and confusion, the German forces suffered 120,000 casualties and lost irreplaceable stores of matériel.1234

Ultimately, the offensive failed to achieve its strategic objectives. By committing these final reserves to an abortive operation, Germany forfeited its capacity to maintain prolonged resistance against the advancing Allied forces. This irreparable blow left the German military unable to prevent the subsequent Allied advance, leading to Germany's surrender less than four months later.124