Forty-two thousand Union troops were encamped on the east bank  of the Tennessee River, waiting for General Don Carlos Buell and  the Army of the Ohio to join them in an assault on Mississippi.  
Forty-two thousand Union troops were encamped on the east bank  of the Tennessee River, waiting for General Don Carlos Buell and  the Army of the Ohio to join them in an assault on Mississippi.  General Albert Sidney Johnston decided to attack before the  reinforcements could get there. P.G.T. Beauregard, who based his  plan of attack on Napoleons strategy at Waterloo, wired President  Davis news of a complete victory after the first day, but Buells  troops arrived at dawn and drove the rebels back. FTP, name this  April 1862 battle.
Forty-two thousand Union troops were encamped on the east bank  of the Tennessee River, waiting for General Don Carlos Buell and  the Army of the Ohio to join them in an assault on Mississippi.  
{Shiloh} or {Pittsburg Landing}