During that night Buell's army, itself outnumbering what remained of Beauregard's, was hurrying to reinforce Grant who planned to renew the conflict at dawn with every prospect of reversing the first day's results and wresting victory from what had been so nearly a complete and disastrous defeat.
Early on the morning of the seventh of April Grant, reinforced by Buell's men and having now an overmastering superiority of numbers, took the offensive and assailed Beauregard's weakened army with a determination which under the circumstances could mean nothing less than victory.
But Beauregard was an obstinate fighter and a skilful one and his men were Americans of the same race and lineage and traditions as those they were meeting in battle. There was terrible fighting, therefore, on that second day, and it was only after a very desperate and a very bloody struggle, hours long in duration, that Grant regained the ground lost on the day before.
But Beauregard's struggle on that second day was rendered hopeless from the outset by irresistible odds of numbers, and after a heroic resistance he withdrew his army and retired in good order and unmolested to his strongly fortified position at Corinth.
Thus ended one of the great and decisive battles of the war. The Federals had lost 13,047 men--killed, wounded and prisoners. The Confederate loss was officially reported at 10,699 men. They had captured the whole of Prentiss's division, 2,200 strong.
But the respective losses did not accurately measure the importance of the contest. The battle left the Confederates baffled in their attempt to overthrow Grant, but not less determined than ever to fight the matter out to that conclusion which they religiously believed to be their due of righteousness. On the other hand, it left the Federal army in overmastering force on the Confederate side of a river which constituted the last serious natural obstacle to Grant's purposed march to the gulf.
But Grant was again immediately superseded in the chief command and forbidden to press the Confederates with that tireless and ceaseless activity which was the dominant characteristic of his military methods. He had now an army of about 120,000 men. In front of him lay the enemy upon a weakly defensive line with an army reduced by battle losses to less than 40,000 effectives. It was obviously Grant's greatest opportunity, but he was not permitted to seize it and turn it to account. For no sooner was the battle completely won than General Halleck hurried down from St. Louis and himself assumed command.