Field Marshal Montgomery insisted priority be given to his 21st Army Group's attack being made in the north, while Generals Bradley (12th U.S. Army Group) and Devers (Sixth U.S. Army Group) insisted they be given priority in the center and south of the front (respectively). Eisenhower worked tirelessly to address the demands of the rival commanders to optimize Allied forces, often by giving them tactical latitude; many historians conclude this delayed the Allied victory in Europe. However, due to Eisenhower's persistence, the pivotal supply port at Antwerp was successfully, albeit belatedly, opened in late 1944.[97]

Eisenhower as General of the Army, 1945
In recognition of his senior position in the Allied command, on December 20, 1944, he was promoted to General of the Army, equivalent to the rank of Field Marshal in most European armies. In this and the previous high commands he held, Eisenhower showed his great talents for leadership and diplomacy. Although he had never seen action himself, he won the respect of front-line commanders. He interacted adeptly with allies such as Winston Churchill, Field Marshal Bernard Montgomery and General Charles de Gaulle. 