The reorganization of the army took place on the 26th of June, and was known as the Army of Virginia, and Major General John Pope assigned by the President to the chief command.  The 25th, 75th, 55th and 73d Ohio regiments constituted the second brigade of the first division of the first corps.  Col. N. C. McLean of the 75th Ohio, was the brigade commander, Major General Robert C. Schenck was the division commander, and Major General Franz Sigel corps commander.
     The 25th remained at Strausburg until July 6th,, when with its corps it marched through Middleton, Front Royal and Luray, via Thornton's Gap, to Sperryville, arriving there on the 10th.
     On the evening of August 8th, the first corps left Sperryville, passed through Culpepper, and arrived on the battle field of Slaughter Mountain August 10th.  The corps was placed in position for the next day's fight, but during the night the enemy retreated.  The corps moved forward to the Rapidan, where it was halted until the 15th, when it marched via Culpepper C. H. to White Sulphur Springs.
     The Regiment took its full share in the various movements culminating in the second battle of Bull Run, and the following official report of Col. Wm. P. Richardson carries the history of the Regiment to include that engagement:

HEADQUARTERS 25TH REG'T O. V. I., }
UPTON HILL, VA., SEPT. 19, 1862.}

COL. N. C. MCLEAN, Comdg. 2d Brigade, 1st Div., 1st Army Corps:

     SIR - I beg leave to submit the following report of the part taken by my Regiment in the maneuvers and battles of Pope's army, from the 21st of August to the 31st of the same month.
     On the 21st day of August, we were at the White Sulphur Springs, in Fauquier county, Virginia, and received orders to send our baggage trains to Warrenton, taking with the Regiment four wagons, two for ammunition, and two for supplies.  Five days' rations were issued - that is , of hard tack, sugar and coffee - and we marched to the neighborhood of Rappahannock Station.  In the evening we were moved further up the river, and encamped for the night.  Heavy cannonading had been kept up all day down the river on our left.  On the morning of the 22d we moved up to Freeman's Ford, and immediately upon our arrival, our artillery became engaged.  General Sigel himself came on the ground, and superintended the planting of a battery of reserve artillery, in addition to the one of our brigade at time engaged.  After some two or three hour's heavy firing, the rebel batteries were silenced or withdrawn.  Soon after, Bohlene brigade of Schenck's division was sent over to the river for some purpose unknown to me.  They crossed the river near the left of our brigade.  The ford was deep and the bank of difficult ascent.  After they had penetrated some distance into the country on the opposite side of the river, heavy firing was heard, and it presently became evident that our forces were falling back to the ford.  By your direction my Regiment was placed as quickly as possible in a situation to command the ford and protect our troops in recrossing.  The enemy advanced in heavy force, but upon receiving our third fire retired, and all the troops on the south side passed safely over before dark.  In this skirmish we had one man mortally wounded - George Ogden, corporal of Company G.  We remained that night at Freeman's Ford.  On the morning of the 23d we received orders to march, and after considerable delay we started on our return to the springs, arriving in the neighborhood of them after sun down.  A short skirmish occurred on our left, which was kept up some time after dark.  I was informed it was Milroy's brigade that was engaged.  On the morning of the 24th, my Regiment and the 73d Ohio, with four pieces of artillery of DeBeck's battery, were sent on a reconnaissance, and after advancing two miles, it was ascertained that the rebels had recrossed the river, and had some batteries in position on the opposite side.  They were opened upon by our battery, but did not reply.  Shortly afterwards we were joined by our brigade, marched to Waterloo bridge, and encamped for the night.  We remained in the neighborhood of Waterloo bridge all day of the 25th.  Nothing of importance occurred, except that all day large bodies of rebel troops could be seen passing north and west, at a distance of some four or five miles from the river, and about sundown it was found they had crossed above us in force.  About dark we received orders to march, and proceeded in the direction of Warrenton.  The night was very dark, and roads miserable, the progress very slow, and excessively fatiguing to the men.  We arrived at Warrenton at 2 o'clock on the morning of the 26th, and remained there all that day, starting on the morning of the 27th for Gainesville, which place we reached about dark.  When within four miles of Gainesville, our advance guard came up with the rear of some rebel force; skirmishing was kept up until we stopped for the night, and several prisoners taken.  On the morning of the 28th we were marched towards Manassas, taking several prisoners along the road.  When within a short distance of Manassas, we turned around and marched towards Gainesville, and having proceeded in that direction some distance, were again countermarched towards Manassas, and then turned to the left towards Bull Run.  About sundown we came within sight of the rebel force, and after some skirmishing took up a position, and our battery opened upon a rebel battery in the edge of the woods.  About dark a sharp engagement took place a mile or two to our left, the force upon our side engaged being under General King.  Early on the morning of the 29th we wee in motion, and advanced on the south side of the road, in all perhaps two miles, and occupied during part of the day the ground upon which the battle had been fought by General King.  We found some of his wounded who were cared for by your direction.  In the afternoon the enemy appeared endeavoring to pass around our left, and we were marched to the left and rear, and late in the evening were withdrawn to a position a short distance in advance of the one we had occupied in the morning.  Although frequently under fire of the enemy's artillery, we had no opportunity of using our small arms, and we had but two men wounded.  After dark an attempt was made upon our lines by the enemy, and a portion of the night was spent under arms.  We remained in our position on the 30th until about four o'clock in the afternoon, when the brigade was ordered to take up a position on Bald Hill to our left, to support General Reynolds.  You placed your brigade in position, and your battery as follows:  The 75th Ohio on the right of the battery in line; the 25th and 73d Ohio regiments in line on the left of the battery.
     A short time after we had taken our position the troops on our left marched past us by the right flank and in our front, and disappeared to our right.  The enemy soon appeared in our front, driving before them a regiment of Zouaves.  You opened upon them as soon as they came within range, with grape and canister, and the infantry were soon after briskly engaged in firing.  They were driven back by our fire in considerable confusion, and unquestionably heavy loss.  They made their appearance again directly in front of the 73d Ohio, in the edge of the woods, but were a second time driven back by our fire.  Our men were in high spirits, feeling confident of their ability to maintain their position, when a large force of the enemy were perceived advancing with artillery, on our left and rear.  They opened upon us at the same time, with grape, canister and infantry.  In a short time the regiment on my left, under a terrific fire, gave way.  Shortly afterwards, an order was given to change front, which I attempted to execute, but the fire was so terrible, and the noise of the battle so great, that it was impossible to be heard or do anything without confusion.  We were forced from our position, and retired to the woods in our rear.  My men behaved well, indeed gallantly; but by some blundering we were left unprotected on our left, and then came the murderous assault on three sides of us, which resulted as I have stated.
     I wish to state, before closing this report, that the constant marching, both day and night, for the last twelve days previous to the 30th, had reduced my number of effective men to two hundred and thirty on the day of the battle; and many of those bare-footed, and all of them exhausted.  I further desire to protest against what I consider the injustice done to the troops of Sigel's corps, by a published report of Major General Pope.  From the 21st to the 31st of August, some portion of our corps was engaged every day, often fiercely; our marches have been extraordinary and our losses great.  Yet we have been totally ignored.  I am glad also to state that the officers and men of my command have every confidence in the ability, bravery and patriotism of the commanding general of the corps, and fully believe that no part of the disaster of Bull Run was produced by any act, neglect or omission of his; but, on the other hand, that if he had had control of the army,  it would not have happened.
     The following is a list of the casualties in my regiment:
KILLED:
Co. E:
Private John Ferrel
Co. H:
Alvin N. Burlingham
Co. G:
Privates:
John Benny
Geo. W. McVicker
Co. K:
Sergt. Lewis F. Shannon
Privates:
Enos W. Miner
Edward D. Peck

MISSING:
Co. A:
Privates:
Wm. T. Lockwood
James McMullen
George W. Iden
William T. Andrews
Co. B:
Privates:
Newlin C. Mercer
Joseph Stewart
William Lowther
James Trigg
Co. E:
Privates Jesse C. Chance
Hiram Odell
Co. G:
Private Erwin M. Bergstresser
Co. H:
Privates:
Thomas Cooper
J. N. Stevens
O. J. Dunn
Co. K:
Corporal Wm. T. Ketchum
Privates:
Charles Cholett
Lewis Miller
James Benway
John A. Church
Richard M. Sherman
William Vickery
David H. Linn

WOUNDED: 
Co. A:
Privates:
Drewer C. Iveson
William H. Crisswell
George Cass
Robert Creighton
John McKirahan
Robert A. Fowler
Reuben Donnally
Emanuel Riley
John Lebold
Co. B:
Sergt. Hugh McConville
Privates:
Daniel Berry
Oliver P. Smith
John W. Doherty
Co. C:
Corporal John Tisher
Corporal Thomas Batton
Privates:
Jacob H. Bailey
Joseph Sill
Francis Schonhart
John W. Hoskins
Robert Longwell
William Batton
Co. E:
Sergeant Elisha Biggerstaff
Sergeant Charles Ladd
Corporal Cyrus Odell
Privates:
Lucius Marsh
John Tweedle
John Leary
Elbridge Comstock
Franklin Wright
William Lowry
Flavius N. Lowrey
James W. Barnes
Darius Minnier
Co. G:
Privates:
James C. Houston
Ephraim H. Lewis
James Male
Geo. Taylor
Co. H:
Private David Hartley
Co. I:
First Lieut. John D. Merryman
Corporal Joseph Cunningham
Corporal Samuel G. Shirk
Corporal Emanuel DeNoon
Privates:
Wm. Gant
Nelson C. Loveatt
Benjamin F. Rickey
Charles Weinstein
Co. K:
Sergeant Peter Triquart
George Huyck (mortally)
James Moran

Very respectfully, your obedient servant,
(signed) WM. P. RICHARDSON,
Col. 25th Reg't. O. V. I.
Thomas Rose

     At this late day (1883), over twenty years after the above report was written, it is gratifying to pick up a recently published volume, and find justice at last done to the second brigade, referred to in Richardson's report.  The volume referred to is "THE ARMY UNDER POPE," by John Codman Ropes, and contains the only reliable account of Pope's campaign in Virginia that has yet been published.  Every soldier of the Army of the Potomac, at least, should read this excellent work.  In speaking of the engagement on Bald Hill, where the 25th Ohio sustained its principal loss, the author says:
     The struggle for the possession of Bald Hill, was most obstinate and sanguinary.  McLean's brigade of Schenck's division was first sent to hold it, and did hold it handsomely, repulsing several attacks both in front and rear, until the command was reduced to a skeleton.  Schenck himself was severely wounded at the head of the reinforcements which he was leading to McLean's support.    *   *   *   The two brigades of Koltes and Krysanowski were put in, and for a time stayed the advancing tide.  The losses were very severe, as the enemy were in large force.  The brave Colonel Koltes here fell, sword in hand, at the  head of his men.  In the conflict around this hill, General Tower was severely wounded at the head of two of Rickett's brigades, and Col. Fletcher Webster, of the12th Massachusetts, a son of the great statesman, was killed while leading his regiment.
     In their first attack on this strong position, even the impetuosity of Hood's Texans failed to make any impression.  Hood was compelled to fall back, and all that could be done, says Evans, who commanded the Division, was to hold the enemy with the other brigade until Anderson's division came up.  In one of his brigades, 631 officers and men were killed and wounded.  Probably one-fourth of the actual force present on the field.  Two Colonels were killed and one wounded.
     D. R. Jones (Confederate) also found his way to the Chinn House, and the two brigades which he had with him "went in most gallantly, suffering severe loss."  In one of these brigades, (Anderson's,) consisting of five regiments, but one field officer was untouched.  They had to fall back, however, and were evidently very severely handled.  The account which Generals Benning and Anderson give of their experience with these two brigades is very interesting.  It was evident that the troops who held the hill held it with obstinate courage, and that they yielded only to the assaults of fresh troops.  Jones' division got no further than the Chinn House that day.
     In spite, however, of this heroic resistance, the enemy carried the position by main force.  They suffered heavily, but fresh relays pressed on with great enthusiasm, and they finally drove our forces from Bald Hill.
     Thus ended, so far as our brigade was concerned, the second battle of Bull Run, or as the rebels call it, the battle of Manassas.  It was a severe defeat to the Union army, and a humiliating one to Gen. Pope.  Yet it was not a panic, nor did it partake of the nature of the rout.  There were some stragglers hastening to the rear, as is always the case in a general engagement.  But the army, as an army, retired under orders,, and the retreat was conducted in good order, with no pursuit.  The army was really defeated, when the engagement took place at Henry House hill.  The position was important, and, if lost to Pope's army, might possibly turn the decent retreat into a disorderly panic.  But the position was not lost, and after repeated charges, of the most desperate character, the rebels were forced to give up the contest.
     The history of the war does not furnish a single instance, upon either side, where the defeated army behaved as creditably as did Gen. Pope's army on this memorable day; and when, on the evening of the 30th, it arrived at Centreville, the organizations were perfectly preserved.
     On the 3d of September the Regiment marched, via Fairfax C. H. and Vienna, to Upton Hill, having since the 8th of August marched 220 miles, been under fire fourteen days in succession on the Rappahannock, and participated in the second battle of Bull Run.
     The Regiment remained in camp at Upton Hill until September 25th, when it was ordered to Centreville.  On the 29th  it was again on the march through Manassas Junction to Warrenton, and from there back to Centreville, where it remained until November 2d, when the entire corps marched to Thoroughfare Gap, remaining there until the 19th, and then returning to Chantilly.
     About this time Capt. Asa Way, of Company G. resigned his commission, on account of disability.  Dr. William Walton, of Woodsfield, Ohio, joined the Regiment as second assistant surgeon.
     The Regiment remained at Chantilly until December 10th, 1862, when with its brigade it was placed en route for Fredericksburg, but arrived there too late to participate in the battle, and marched back to Stafford C. H.  It was at this place, where after much neglect, all the sutlers came in with loaded wagons.  The men had not yet been paid, or not for some time, at least, and many hungry eyes were fixed longingly upon the wagons.  Private ____, of Company K, was equal to the occasion - carefully noting the time at which the guard was to be relieved, and the number of the relief, he "borrowed" a sergeant's blouse, and made a special detail of his own.  About ten minutes before the regular relief was due, he made the rounds, relieving every man on guard around the wagons, and before the trick was discovered tehre was only a "beggarly array" of empty wagons left.  The peculiar facility with which the boys of the 25th could do up a job of that kind, merited, and received the appreciation of the balance of the division.  The boys engaged in the fraudulent relief never were discovered.
     We remained in camp at the Court House until January 20th, 1863, when the brigade marched to Belle Plains, but in a few days returned to the neighborhood of the old camp, and built permanent winter quarters.
     While the Regiment was at Belle Plains, Adjt. William L. Hoyt resigned his commission.