The remainder of Nelson's division followed Ammen's brigade late in the evening. Crittenden's division arrived in the night. McCook receiving orders to hasten forward in the morning, while twelve miles out from Savannah, halted at the outskirts of the village at seven o'clock P.M., rested his men two hours, marched to the landing, seized such boats as were there and such as arrived, and reached Pittsburg Landing at five o'clock Monday morning with Rousseau's brigade and one regiment of Kirk's brigade. General Grant and General Buell met at Sherman's headquarters in the evening; it was there agreed that Buell with his army should in the morning attack on the left, and Grant's immediate command should attack on the right. Buell formed Nelson's division about two hundred yards in front of the reserve artillery, with his left near the river, facing south. Crittenden, when he arrived, was placed in rear of Nelson, half a mile from the landing, where his command stood at arms all night. At eleven o'clock a heavy rain began to pour. All the National troops and most of the Confederate lay on the ground without shelter. The gunboats every fifteen minutes through the night fired a shell over the woods, to explode far inland and banish sleep. Early Monday morning, Nelson on the extreme left, on the Hamburg road, and Lewis Wallace on the extreme right, by Snake Creek, moved to the attack. Beauregard knew then that Buell had arrived and the junction of the two National armies had been effected. The opening of the battle proclaimed what the conclusion would be.