One of the Mississippi regiments tried again to outflank Colonel Baker's left. The Rebels came within fifty feet of the California regiment; but the constant and steady fire given by that regiment again forced them back. It was an unbroken roll of musketry through the afternoon. The Union soldiers held their ground manfully, but their ammunition was giving out. The men, as fast as their cartridge-boxes became empty, helped themselves from the boxes of their fallen comrades. They could not obtain reinforcements for want of boats, although there were troops enough upon the Maryland shore to overwhelm the enemy. The boats were old and leaky, and were used to carry the wounded to the island. General Stone had taken no measures to obtain other boats. He was at Edward's Ferry, within sight and sound of the battle. He had fifteen hundred troops across the river at that point, and he might have ordered their advance towards Leesburg. They could have gained General Evans's rear, for there was no force to oppose them. The troops stood idly upon the bank, wondering that they were not ordered to march. So the brave men on the bluff, confronted by nearly twice their number, were left to their fate. "We can cut our way through to Edward's Ferry," said Colonel Devens. "If I had two more such regiments as the Massachusetts Fifteenth, I would cut my way to Leesburg," said Colonel Baker. He went along the line encouraging the men to hold out to the last. His cool bearing, and the glance of his eagle eye, inspired the men and they compelled the Rebels again and again to fall back. Lieutenant-Colonel Wistar was wounded, but refused to leave the field. He remained with his men and kept a close watch upon the ravine and the hillock at his left hand. He saw that General Evans was making preparations for a desperate onset. He was gathering his troops in a mass behind the hill. "Drive the Yankees into the Potomac," said General Evans, again. He had more than two thousand men. "There is not a moment to lose. A heavy column is behind the hill and they are getting ready to advance," said Colonel Wistar, hastening to Colonel Baker. Lieutenant Bramhall was ordered to open upon them with his rifled gun. He brought it into position and fired a round or two, but two of his cannoneers were instantly killed and five others wounded. Colonel Baker, Colonel Wistar, and Colonel Cogswell used the rammer and sponges, and aided in firing it till other cannoneers arrived. Colonel Wistar was wounded again while serving the gun. They could not reach the main body of Rebels behind the hill, but kept the others in check with canister as often as they attempted to advance.