On July 12, 1918, Colonel Franklin A. Denison, who had commanded the regiment up to this time and had become incapacitated through illness contracted during the strenuous days incident to the preparation of the regiment for service in the lines, was relieved from command on this account and Colonel T.A.  Roberts, cavalry, assumed command of the regiment.

The 3rd battalion under command of Major Williams, was held in reserve at Vraincourt, and only Company M of that battalion was sent into the front lines.  This company took up positions in the supporting point at Buzemont on August 7, 1918, and remained until August 14, 1918.

On August 1, 1918, the Stokes Mortar platoon under command of Lieutenant Robert A. Ward took position in the lines in the sub-sector Vaquois, and on August 4, 1918, took an active part in a coup-de-main arranged by the French.  His mission, filling in the gaps in the French artillery barrage, was so successfully accomplished that his entire platoon was highly commended for their work by the commanding general of the division.

Although patrols were operating between the lines nightly and the positions occupied were under artillery, machine gun and rifle fire a number of times, the only losses sustained during the six weeks in the Argonne Forest were 1 killed, 1 captured and 4 wounded.

On the night of August 15-16, 1918, the regiment was relieved from its positions in the Forest and marched to Rampont and entrained for villages in the vicinity of Fains (Meuse) for a period of rest, arriving on August 18, 1918.

Upon arrival at the new stations, instruction was begun again, more attention being paid to open warfare than to work incident to trench warfare.  This training proved of great value to the officers and men in the latter days of the war, when the regiment was actively engaged in the pursuit of the enemy to the Belgian border.

On September 11, 1918, the regiment left its various stations and proceeded by train to Betz, where it detrained and marched to stations in villages in the vicinity of Mareuil-sur-Ourcq (Meuse).

On September 11, 1918, Majors Hunt and Williams having become incapacitated through illness and injury, were relieved from command of the 2nd and 3rd Battalions, respectively, and Lieutenant Colonel Otis B. Duncan and Captain John H. Patton were assigned to the command of those battalions.

The battles of Chavigny, Leury and the Bois de Beaumont having reduced the effectives of the 59th French Division, the regiment was placed at the disposition of the division and was assigned as one of the three infantry regiments thereof.  Upon joining this division the effective strength of the regiment was approximately double that of either of the two French regiments; and in future operations a large share of the work of the division fell to our lot.