The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 1: The Opening Battles.
Francis Trevelyan Miller, Ed.

Meantime, the Union army had moved southward and was concentrating at Pittsburg Landing, on the Tennessee River, an obscure stopping place for boats in southern Tennessee, and some twenty miles northeast from Corinth. The name means more now than merely a landing place for river craft. It was clear that two mighty, hostile forces were drawing together and that ere long there would be a battle of tremendous proportions, such as this Western hemisphere had not then known.

General Grant had no idea that the Confederates would meet him at Pittsburg Landing. He believed that they would wait for an attack on their entrenchments at Corinth. The position his army occupied at the Landing was a kind of quadrilateral, enclosed on three sides by the river and several small streams that flow into it. As the early days of April passed there were ominous rumors of the coming storm; but Grant was so sure that Johnston would not attack that he spent the night of the 5th of April at Savannah, some miles down the Tennessee River.

It was Saturday night. For two weeks the Union troops had occupied the undulating tableland that stretched away from the river at the Landing. There was the sound of the plashing streams overflowing from recent rains, there were revelry and mirth around the thousand camp-fires; but there was no sound to give warning of the coming of forty thousand men, who had for two days been drawing nearer with a steady tread, and during this night were deploying around the Union camp, only a mile away. There was nothing to indicate that the inevitable clash of arms was but a few hours in the future.

At the dawn of day on Sunday, April 6th, magnificent battle-lines, under the Confederate battle-flag, emerged from the woods on the neighboring hills within gunshot of the Federal camps. Whether the Union army was really surprised has been the subject of long controversy, which we need not