The victorious column of the enemy was subjected to the fire of a battery on Little Round Top, and to another farther to the right; but it kept on, went around Ward's brigade and rushed eagerly up the ravine between the two Round Tops to seize Little Round Top which seemed to be defenceless. Vincent's brigade rapidly formed on the crest of a small spur which juts out from the hill, and not having time to load, advanced with the bayonet, in time to save the height. The contest soon became furious and the rocks were alive with musketry. General Vincent sent word to Barnes that the enemy were on him in overwhelming numbers, and Hazlett's regular battery, supported by the 140th New York under Colonel O'Rorke of Weed's brigade, was sent as a reinforcement. The battery was dragged with great labor to the crest of Little Round Top, and the 140th were posted on the slope on Vincent's right. They came upon the field just as the rebels, after failing to penetrate the centre, had driven back the right. In advancing to this exposed position, Colonel O'Rorke, a brilliant young officer who had just graduated at the head of his class at West Point, was killed and his men thrown into some confusion, but Vincent rallied the line and repulsed the assault. In doing so he exposed himself very much and was soon killed by a rebel sharpshooter. General Weed, who was on the crest with the battery, was mortally wounded in the same way; and as Hazlett leaned over to hear his last message, a fatal bullet struck him also and he dropped dead on the body of his chief. Colonel Rice of the 44th New York now took command in place of Vincent. The enemy having been foiled at the centre and right, stole around through the woods and turned the left of the line; but Chamberlain's regiment--the 20th Maine--was folded back by him, around the rear of the mountain, to resist the attack. The rebels came on like wolves, with deafening yells, and forced Chamberlain's men over the crest; but they rallied and drove their assailants back in their turn. This was twice repeated and then a brigade of the Pennsylvania Reserves and one of the Fifth Corps dashed over the hill. The 20th Maine made a grand final charge and drove the rebels from the valley between the Round Tops, capturing a large number of prisoners. Not a moment too soon, for Chamberlain had lost a third of his command and was entirely out of ammunition. Vincent's men in this affair took two colonels, fifteen officers, and five hundred men prisoners, and a thousand stand of arms. Hill in his official report says "Hood's right was held as in a vise."