On the 6th April 1862 Grant’s victorious and reinforced Army was surprised in its camps by a similar numbered Confederate army(40000) under a Kentucky born Texan and the former commander of the 2nd US Cavalry, AS Johnston. The plan was simple: hit hard and push the damn Yankees into the Tennessee. To ensure success troops were gathered from all over the Southern Confederacy, including the port cities of New Orleans, Mobile and Pensacola.
The Southern army of 16 Brigades was in 4 Corps, 2 of which were small 3 Brigaded non Divisions. The troops came from 9 different States, but a third were from Tennessee. Grant’s army was 18 Brigades in 6 Divisions, half from Ohio and Illinois.
Johnston’s army had marched the short distance from its camps and did thoroughly surprise Grant’s(who was absent, but returned by 9am), pushing them back towards the river. Coordination among the Southern units was impossible because of the wooded terrain and because the Southern plan called for the 4 Corps to fight one behind each other, rather than side by side. Units obviously got mixed in with those from other commands. Added to this, the 3 Union Divisions in the front line held on and when one broke and ran( Prentiss’ small one) another, Hurlburt’s, from his camp further back took its place. This area was known as the Hornet’s Nest and seemed to suck in Southern units, which should have bypassed it. Casualties mounted as Southern units were fed one by one into this killing ground, where as many as 38 guns fired canister after canister. It is thought as many 12 charges were made on this position. It was the commander, Johnston, who realised that the position was best flanked and it was on this right flank that he fell mortally wounded, a bullet cutting an artery behind his knee. This had been his plan all along: cut the Union army off from its Pittsburg Landing base, but after his death no one knew how to implement it and the objective, only 1 1/2 miles distant was never reached. Opportunity was lost as other commanders were drawn to the fighting in the centre.
The new commander, a Creole aristocrat and former Engineer in the US army, PGT Beauregard decided he would renew the attack on the morrow. His army was sorely battered and what Johnston had feared had come to pass: Union reinforcements were arriving by boat.