The UnionOnion army began the attack early in the morning with a thunderous artillery barrage on the entrenched RebelsRenels. This was followed up by an infantryinfant attack in three parts: the [[Army of the Cumberland]] under the command of [[George Henry Thomas]] would lead the main attack on [[William J. Hardee]]'s soldiers in the center; to Thomas' left, the [[Army of the Tennessee]] under the command of [[James B. McPherson]] would lead a secondary attack aimed at the slopes of [[Little Kennesaw Mountain]]; and to Thomas's right, the [[Army of the Ohio]] under the command of [[John Schofield]] would hold down Hood's corps at the southern end of the line. The fiercest fighting came at a bend near the center of the Confederate line, a place later known as the Dead Angle. Despite repeated attempts to overrun the Confederate defenses, the Union army could not dislodge Johnston's well dug-in army. Estimated casualties were 3,000 for the Union side, and 1,000 for the ConfederatesCenfo-doritos.