The battle was soon in progress--the heaviest of the campaign. It continued for seven or eight hours. The Confederates were defeated with a loss of nearly all their artillery and about half their force, including four thousand men who were cut off from the main army and failed to rejoin it. On the banks of the Big Black River, a few miles westward, the Confederates made another stand, and here the fifth battle of the investment of Vicksburg took place. It was short, sharp, decisive. The Confederates suffered heavy losses and the remainder hastened to the defenses of Vicksburg. They had set fire to the bridge across the Big Black, and Grant's army was detained for a day--until the Confederates were safely lodged in the city. The Federal army now invested Vicksburg, occupying the surrounding hills. It was May 18th when the remarkable campaign to reach Vicksburg came to an end. In eighteen days, the army had marched one hundred and eighty miles through a hostile country, fought and won five battles, captured a State capital, had taken twenty-seven heavy cannon and sixty field-pieces, and had slain or wounded six thousand men and captured as many more. As Grant and Sherman rode out on the hill north of the city, the latter broke into enthusiastic admiration of his chief, declaring that up to that moment he had felt no assurance of success, and pronouncing the campaign one of the greatest in history. The great problem of investing Vicksburg was solved at last. Around the doomed city gleamed the thousands of bayonets of the Union army. The inhabitants and the army that had fled to it as a city of refuge were penned in. But the Confederacy was not to yield without a stubborn resistance. On May 19th, an advance was made on the works and the besieging lines drew nearer and tightened their coils. Three days later, on May 22nd, Grant ordered a grand assault by his whole army. The troops, flushed with their victories of the past three weeks, were eager for the attack. All the corps commanders set their watches by Grant's in order to begin the assault at all points at the same moment--ten o'clock in the morning. At the appointed time, the cannon from the encircling lines burst forth in a deafening roar. Then came the answering thunders from the mortar-boats on the Louisiana shore and from the gunboats anchored beneath the bluff. The gunboats' fire was answered from within the bastions protecting the city. The opening of the heavy guns on the land side was followed by the sharper crackle of musketry--thousands of shots, indistinguishable in a continuous roll.