I now determined on a second assault. Johnston was in my rear, only fifty miles away, with an army not much inferior in numbers to the one I had with me, and I knew he was being reinforced. There was danger of his coming to the assistance of Pemberton, and after all he might defeat my anticipations of capturing the garrison if, indeed, he did not prevent the capture of the city. The immediate capture of Vicksburg would save sending me the reinforcements which were so much wanted elsewhere, and would set free the army under me to drive Johnston from the State. But the first consideration of all was—the troops believed they could carry the works in their front, and would not have worked so patiently in the trenches if they had not been allowed to try.
The attack was ordered to commence on all parts of the line at ten o'clock A.M. on the 22d with a furious cannonade from every battery in position. All the corps commanders set their time by mine so that all might open the engagement at the same minute. The attack was gallant, and portions of each of the three corps succeeded in getting up to the very parapets of the enemy and in planting their battle flags upon them; but at no place were we able to enter. General McClernand reported that he had gained the enemy's intrenchments at several points, and wanted reinforcements. I occupied a position from which I believed I could see as well as he what took place in his front, and I did not see the success he reported. But his request for reinforcements being repeated I could not ignore it, and sent him Quinby's division of the 17th corps. Sherman and McPherson were both ordered to renew their assaults as a diversion in favor of McClernand. This last attack only served to increase our casualties without giving any benefit whatever. As soon as it was dark our troops that had reached the enemy's line and been obliged to remain there for security all day, were withdrawn; and thus ended the last assault upon Vicksburg.
CHAPTER XXXVII.
SIEGE OF VICKSBURG.
I now determined upon a regular siege—to "out-camp the enemy," as it were, and to incur no more losses. The experience of the 22d convinced officers and men that this was best, and they went to work on the defences and approaches with a will. With the navy holding the river, the investment of Vicksburg was complete. As long as we could hold our position the enemy was limited in supplies of food, men and munitions of war to what they had on hand. These could not last always.
The crossing of troops at Bruinsburg commenced April 30th. On the 18th of May the army was in rear of Vicksburg. On the 19th, just twenty days after the crossing, the city was completely invested and an assault had been made: five distinct battles (besides continuous skirmishing) had been fought and won by the Union forces; the capital of the State had fallen and its arsenals, military manufactories and everything useful for military purposes had been destroyed; an average of about one hundred and eighty miles had been marched by the troops engaged; but five days' rations had been issued, and no forage; over six thousand prisoners had been captured, and as many more of the enemy had been killed or wounded; twenty-seven heavy cannon and sixty-one field-pieces had fallen into our hands; and four hundred miles of the river, from Vicksburg to Port Hudson, had become ours. The Union force that had crossed the Mississippi River up to this time was less than forty-three thousand men. One division of these, Blair's, only arrived in time to take part in the battle of Champion's Hill, but was not engaged there; and one brigade, Ransom's of McPherson's corps, reached the field after the battle. The enemy had at Vicksburg, Grand Gulf, Jackson, and on the roads between these places, over sixty thousand men. They were in their own country, where no rear guards were necessary. The country is admirable for defence, but difficult for the conduct of an offensive campaign. All their troops had to be met. We were fortunate, to say the least, in meeting them in detail: at Port Gibson seven or eight thousand; at Raymond, five thousand; at Jackson, from eight to eleven thousand; at Champion's Hill, twenty-five thousand; at the Big Black, four thousand. A part of those met at Jackson were all that was left of those encountered at Raymond. They were beaten in detail by a force smaller than their own, upon their own ground. Our loss up to this time was:
| KILLED | WOUNDED | MISSING | |
| Port Gibson................. | 131 | 719 | 25 |
| South Fork Bayou Pierre..... | .. | 1 | .. |
| Skirmishes, May 3 .......... | 1 | 9 | .. |
| Fourteen Mile Creek......... | 6 | 24 | .. |
| Raymond..................... | 66 | 339 | 39 |
| Jackson..................... | 42 | 251 | 7 |
| Champion's Hill............. | 410 | 1,844 | 187 |
| Big Black................... | 39 | 237 | 3 |
| Bridgeport.................. | .. | 1 | .. |
| Total....................... | 695 | 3,425 | 259 |
Of the wounded many were but slightly so, and continued on duty. Not half of them were disabled for any length of time.
After the unsuccessful assault of the 22d the work of the regular siege began. Sherman occupied the right starting from the river above Vicksburg, McPherson the centre (McArthur's division now with him) and McClernand the left, holding the road south to Warrenton. Lauman's division arrived at this time and was placed on the extreme left of the line.
In the interval between the assaults of the 19th and 22d, roads had been completed from the Yazoo River and Chickasaw Bayou, around the rear of the army, to enable us to bring up supplies of food and ammunition; ground had been selected and cleared on which the troops were to be encamped, and tents and cooking utensils were brought up. The troops had been without these from the time of crossing the Mississippi up to this time. All was now ready for the pick and spade. Prentiss and Hurlbut were ordered to send forward every man that could be spared. Cavalry especially was wanted to watch the fords along the Big Black, and to observe Johnston. I knew that Johnston was receiving reinforcements from Bragg, who was confronting Rosecrans in Tennessee. Vicksburg was so important to the enemy that I believed he would make the most strenuous efforts to raise the siege, even at the risk of losing ground elsewhere.