After six weeks training at this place, the regiment entrained enroute to the front, arrived at Ligny-en-Barrios (Meuse) on June 13, 1918, and moved up toward the lines by easy stages. On June 21, 1918, the regiment began occupying positions in the Saint Mihiel Sector, completing the occupation on June 24, 1918. This being the first time the regiment had been actually in the lines, the division commander deemed it advisable to intermingle our troops with French troops in order that officers and men might observe and profit by close association with the veteran French troops. Thus the units of the 1st and 2nd battalions, which had been assigned to the front lines were intermingled with platoons and companies of the 325th regiment of infantry. Many valuable lessons were learned while in this sector, which was exceptionally quiet at the time. Except for occasional shelling and some scattered machine gun and rifle fire, nothing of interest occurred while in the sector, and there were no casualties. On the night of June 30-July 1, 1918, the regiment, having been relieved in the sector, began withdrawing, and on July 3, 1918, the withdrawal had been completed without any losses. After resting a few days in the region of Lignieres (Meuse), the regiment entrained en route to the Argonne Forest, arriving behind the lines on July 6, 1918, the 1st Battalion, under command of Major Stokes, moving up immediately into the reserve positions at Brabant (S. Groupement Courcelles) and later into the front lines in the Center of Resistance de la Foret, Sub-Sector Hermont. The 2nd Battalion under command of Major Hunt took station at Rarecourt, the latter moved up to Locheres (Plateau of Gorgia) at which place the Major located his Commanding Post. From this position companies of the 2nd Battalion were sent into the lines alternately, the companies being relieved after a five days' tour of duty. 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.