As Henry W. Halleck prepares to go to Washington to become general-in-chief, he reorganizes the armies within his Department of the Mississippi.
Less than 48 hours after leaving the Peninsula, Abraham Lincoln names Henry W. Halleck to become commander of all U.S. armies.
Both Federals and Confederates claim victory after a terrible two-day battle, while the shock of such enormous human loss starts to sink in.
The most terrible battle of the war to-date begins as the Confederate Army of Mississippi swarms upon unsuspecting Federals in southwestern Tennessee.
The Confederate Army of Mississippi advances into southwestern Tennessee to confront Ulysses S. Grant’s Federals, who remain largely unaware of the enemy’s approach.
Federal forces advance southward up the Tennessee River as Henry W. Halleck directs two armies to converge to invade the Deep South.