half past ten o'clock
Hildebrand 's brigade of Sherman 's division was engulfed by the cyclone and swept from existence , appearing no more in the battle . In vain the broken lines of the Federal camps were formed and re-formed . Charge followed charge in swift and terrible succession . By half past ten o'clock the Confederates had captured and demolished three great military encampments and taken three batteries of artillery . Storehouses and munitions of war in rich profusion were captured at every turn . The demoralized Union army was retreating at every point . When Grant reached the field , the lines both of attack and defense were lost in confusion .