The siege once begun, the fortress was doomed without recourse. Pemberton, to be sure, did not lose heart, and drove back the repeated Federal assaults with skill and courage. Johnston, from the rear, mustered men as he could, tried to concert with the besieged army a project of escape, and at last advanced to attack. But within the city supplies soon failed, and outside no resources were at hand for the city’s succor. Johnston’s request for twenty thousand men, lying idle in Arkansas had been slighted;[238] there was no other source of supply. Kirby Smith and Dick Taylor attempted a diversion on the west bank of the river; and still later, at Helena, Arkansas, a desperate push was made to afford relief. It was all in vain. The North, made cheerful by long-delayed success, poured forth to Grant out of its abundance both men and means. His army was in size nearly doubled; food and munitions abounded. The starving defenders were inexorably encircled by nearly three times their number of well-supplied and triumphant foes. Grant’s assaults, bold and bloody though they were, had little effect in bringing about the result; the close investment would have sufficed.[239] On July 4th came the unconditional surrender. The Confederate losses before the surrender were fully 10,000; now 29,491, became prisoners, while in the fortress were 170 cannon and 50,000 small arms. Grant’s loss during the whole campaign was 9362.[240] To this triumph, a week later, was added the fall of Port Hudson,[241] which, with a depleted garrison, held out stubbornly for six weeks against the Federals. N. P. Banks, who after his tragical Virginia experiences succeeded, in December, 1862, Butler in Louisiana, was set, as in the valley, to meet a difficult situation with inadequate means. With an army of little more than thirty thousand, in part nine-months men, he was expected to hold New Orleans and such of Louisiana as had been conquered, and also to co-operate with Grant in opening the Mississippi. When his garrisons had been placed he had scarcely fifteen thousand men left for service in the field, a number exceeded at first by the Port Hudson defenders, strongly placed and well commanded. West of the river, moreover, was still another force under an old adversary in the Shenandoah country--Dick Taylor, a general well-endowed and trained in the best school. That Banks, though active, had no brilliant success was not at all strange; yet Halleck found fault. He could not extend a hand to Grant; but, risking his communications--risking, indeed, the possession of New Orleans--he concentrated at Port Hudson, which fortress, after a six weeks’ siege, marked by two spirited assaults, he brought to great distress. Its fate was sealed by the fall of Vicksburg--Gardner, the commander, on July 9th, surrendering the post with more than six thousand men and fifty-one guns.