Vincent had brought his brigade up the east side of Little Round Top and placed them on the hill's southern slope. General Warren had not seen this nor was he informed that northern forces were now on Little Round Top. Urgently Warren went looking for someone to hold this valuable ground. Warren happened upon Weed's brigade, which was once his, as the brigade marched down Wheatfield Road to the north of Little Round Top. At the tail of the column was Colonel Patrick O'Rouke's 140th New York Regiment.

Warren called out to O'Rouke excitedly, "Paddy, give me a regiment!"

"General Weed has gone ahead and expects his brigade to follow." Replied O'Rouke apparently in command of the brigade in Weed's absence.

"Never mine that, bring your regiment up here and I will take responsibility."

It must have been about this time that Vincent and his men were attacked by the Rebels. Chamberlain had his hands full on the south end of the line, but things were far from quiet on the opposite end of Vincent's line.

Emerging from the trees to the east of the Devil's Den came two regiments of McLaws brigade; 4th and 5th Texas. They progressed down the valley, then turned right and charged up the slope towards the Yankees. At first they were driven back and returned to the trees to reform and tried the assault again. Without much more success. They returned to the trees once more and this time joined by the 48th Alabama tried the attack yet again. This time the 120 men of the 16th Michigan, at the end of Vincent's line, began to give way. The 44th New York tried to relive some of the pressure on the 16th Michigan by firing to their right. Vincent seeing the danger rushed to that end of the line to rally the men. Vincent threw himself into the opening in the line, "Don't give an inch!" He was shot through the chest. Colonel Vincent was posthumously promoted to Brigadier General by President Abraham Lincoln.

The Texans must have found the gentler incline in front of the 16th Michigan to be easier to ascend, than on other parts of Little Round Top's bare and rocky western slope. Just as it looked like the boys from Michigan would give way, coming over the top of the hill, in from behind them, came O'Rouke and his 140th New York.

The 140th must have been quite a sight. They had just received new Zouave uniforms and looked pretty "jaunty" with the blue trousers, red vests and fezzes. The terrain was so rough and time so limited that O'Rouke did not realign his men as they came over the top of the hill, instead he drew his sword and shouted, "Down this way boys!" O'Rouke's column advanced in some disorder and as each man went into position next to the 16th, he began to load. O'Rouke shouted, "Here they are men, commence firing!" A Confederate saw O'Rouke and shot him through the neck with a minié ball. Many of the men already in position saw this and returned fire. After battle the curious counted seventeen holes in the brave Confederate's body.

When all 500 of the 140th New York were in position on that rocky gradient they were more than a match for the Texans. As night began to fall what was left of the Texas and Alabama regiments once more returned to the trees. Little Round Top had stayed in the hands of the Federals.