On the right, and in the belt of timber which separated the first from the second field, was Lucas’s cavalry brigade, mostly dismounted and deployed as skirmishers, while beyond and supporting this brigade was the Fourth division, Thirteenth army corps. About four o’clock, the Fourth division was moved forward through the belt of timber, and took position in line of battle behind the fence that inclosed the field beyond. At half-past four, General Ransom and staff passed on foot along the outer infantry line, who were firing very briskly across the field into the woods where the enemy was posted, but as the fire was of little effect the general directed it to be withheld until the rebels came out into the field. For half or three-quarters of an hour, everything remained quiet along the lines, when all at once a heavy and continuous discharge of musketry was heard on the right, from rebel forces marching steadily in close ranks across the open field to the attack; while at the same moment a heavy column was moving across the road upon the left, where the cavalry brigade under Colonel Dudley was posted, aided by Nim’s battery, the two howitzers, and one small regiment of infantry (the Twenty-third Wisconsin.) Every regiment now coolly but rapidly poured its destructive fire upon the advancing foe, opening at every discharge great gaps in the rebel ranks, and strewing the field with a continuous line of killed and wounded. Under this terrific and well-directed fire, the rebel line was checked, broken, and driven back, the only considerable body remaining together being a mass of some three hundred or four hundred directly opposite the Thirteenth Illinois, which was badly cut up, but held its position without breaking. Four guns of Nim’s battery were captured, not having horses to drag them from the field. This movement on the left, however, was simply a ruse on the part of the enemy to induce General Banks to weaken his right wing, and it was successful. At the commencement of the action General Franklin’s divisions were in camp nine miles in the rear, but he hastened forward in advance of his command, and, in conjunction with the commander-in-chief, passed through the midst of the engagement, encouraging by his presence, and leading on the men. The right now became fiercely engaged, and the centre being pressed, fell back, when the right also gave way. The loss of the Chicago battery and the First Indiana soon followed. General Cameron then advanced to the front with a brigade of Indiana troops of the Thirteenth corps, but was unable to check the superior force of the enemy.