He, therefore, gave up the idea of making Grand Gulf a base, and Sherman having now joined him with his corps, Grant struck at once into the interior. He took nothing with him except ammunition, and his army was in the lightest marching order. This enabled him to move with great rapidity, but deprived him of his wagon trains, and of all munitions of war except cartridges. Everything, however, in this campaign, depended on quickness, and Grant's decision, as well as all his movements, marked the genius of the great soldier, which consists very largely in knowing just when to abandon the accepted military axioms.