Once the coastal assault had succeeded, Eisenhower insisted on retaining personal control over the land battle strategy, and was immersed in the command and supply of multiple assaults through France on Germany. 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, though sometimes ineffective, 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, and victory became a more distinct probability.