On the 25th, the Irish Brigade was augmented by the addition of the One Hundred and Forty-fifth Pennsylvania Regiment, and on the 27th, moved its camp down the side of Bolivar Heights to near the Potomac. About this time, Captain Henry R. Sibley, who had a narrow escape from death at Antietam, left for home on sick leave, and the command of Company H devolved upon First Lieutenant Daniel W. Lee, an efficient and conscientious soldier, who, on the 14th of the following January, was commissioned Captain. Captain Sibley never again joined the regiment; a severe and nearly fatal illness followed his return to Massachusetts. Careful medical treatment so far restored him, however, that in June, 1863, he accepted an appointment as Commissary of Subsistence of Volunteers, with the rank of Captain. Upon receiving this appointment, he was ordered to report at New Orleans, where he served honorably for several months, taking part, while in that department, in the movement to Sabine Pass, and in the second Teche and the Red River expeditions. He afterwards served on the staff of Major-General Emory, in the Shenandoah Valley; and at a later period in the war, upon the staffs of Generals Torbett and Hancock. Early in 1865, he was promoted to be Lieutenant-Colonel, and left the service in December, 1865, with the brevet rank of Colonel of Volunteers. He was a very faithful and intelligent soldier, and since the war has been honored with many positions of trust.

On the first day of October, the Brigade was reviewed by President Lincoln, Generals McClellan, Sumner, and Hancock. From this time till the 16th, the Brigade remained in this position, performing picket and drill duty. The new movement of the army into Virginia was close at hand, and feints, strategic operations, and reconnoissances were now frequently occurring. The march on Charlestown, about ten miles from Harper’s Ferry, where the enemy had a small force, was one of the movements preliminary to the grand movement of the whole army.

On the night of the 16th, the entire division received orders to be in readiness to march at daybreak the next morning. On the morning of the 17th, the troops left their camp and started for Charlestown; the day was chilly and the roads muddy. The enemy’s pickets were driven out of the town after some sharp skirmishing, and our division marched in and occupied it, the Twenty-ninth Regiment and the rest of the Irish Brigade being thrown out in advance of the other troops into a field on the outskirts of the town, and in the near vicinity of the spot where John Brown was executed. Near at hand, also, was the jail where the old hero had been confined, and the court-house where he had been tried and received his sentence of death; facts which added somewhat to the interest of the expedition, but did not detract from the discomforts caused by the weather, for when the night set in it began to rain. The enemy were close by, and the utmost watchfulness was necessary, giving the men no opportunity to protect themselves from exposure. The soldiers were thoroughly drenched by the storm, and as soon as it was dark, though on the front line, they began to build fires and make coffee; but quickly the order came for all fires to be extinguished. Later in the night, the report was received that General McClellan had dashed into town accompanied by his entire staff, and with the report came an order to rekindle the fires, and for each man to build two. The order was a welcome one, given probably, not out of consideration for the sufferings of the men, but to create the impression in the enemy’s lines that McClellan had occupied the town in force; and to help on the ruse, the citizens were permitted to pass out and convey to their friends the report, then current, that our army was moving on Winchester. Suddenly, the next morning, when all were expecting a forward movement, the division was ordered to fall back to Halltown. Here it spent another night, quite as severe as the one which had preceded it, and on the morning of the 19th, returned to Harper’s Ferry. No further movement took place till the 29th of October, when the whole army began its march to Falmouth, down the Loudon Valley. On this day, quite late in the afternoon, the regiment left its camp, crossed the Shenandoah on a pontoon bridge, and followed the Potomac down, on the Virginia side, passing over a rough road at the base of Bolivar Heights. The scenery was fine, but the march was mostly performed after dark. Camped in “Pleasant Valley”; weather cool.

October 30. Started at sunrise. The entire Army of the Potomac was moving in the same direction. After a few hours the division divided, the two parts marching in line of battle on opposite sides of the road. Finally the cavalry, batteries, and teams came up, and the camp was formed. Weather fine.

October 31. Regiment ordered for picket, two miles from camp. The several companies were posted on the different roads to watch the enemy. Mustered for pay.

November 1. Ordered back to camp, and upon reaching it, were ordered to march. Went six miles and halted for the night.

November 2 (Sunday). Called into line at daybreak. After going a short distance, deployed into a field, and marched in line of battle over fields and fences, till opposite the entrance to Snicker’s Gap, when a halt was made, and the batteries came up and took position. Just prior to this, as the skirmishers of the Irish Brigade came up with the enemy’s cavalry at this gap, a lively fight ensued, in the course of which Major O’Neil, of General Meagher’s staff, was captured. Our cavalry, however, followed up the enemy and recaptured the gallant Major, who seems to have been peculiarly unfortunate, having before been captured at the battle of Gaines’ Mill.

November 3. The regiment was detailed for ammunition guard. Marched five miles and encamped on a beautiful farm. Weather cool, but fine.

November 4. Drew one day’s rations. Pleasanton’s cavalry, numbering about six thousand, and ten batteries, started with the regiment on the march this morning, which began very early.

November 5. Marched seven miles and encamped on the side of a rough, broken hill. The wind was high and cold, and at midnight it rose to a gale, accompanied by snow and rain.