On September 23, 1917, the First Battalion of the Sixth Regiment sailed on the _Henderson_ from New York and landed at St. Nazaire, France, on October 5, 1917. On October 17, 1917, the Seventy-third Machine Gun Company, Headquarters, and Supply Companies, and Col. Albertus W. Catlin, commanding officer of the Sixth Regiment, with his Staff, sailed from Philadelphia, Pa., on the _De Kalb_, and from New York on October 18, 1917, arriving at St. Nazaire, France, on November 1, 1917. On October 31 1917, the Third Battalion of the Sixth Regiment sailed from New York on board the _Von Steuben_ and anchored at Brest, France, on November 12, 1917. On January 24, 1918, the Second Battalion of the Sixth Regiment sailed on the _Henderson_ from New York and arrived at St. Nazaire, France, February 6, 1918, and with the arrival of this last battalion, the entire Sixth Regiment of Marines was in France. On October 23, 1917, the Fourth Brigade of Marines was organized, with Brig. Gen. Charles A. Doyen in command. Brig. Gen. Doyen continued in command until May 7, 1918, when he published in General Orders No. 5, that he had relinquished command. Maj. Harry R. Lay was the first brigade adjutant, and performed the duties of that office from October 24, 1917, to August 9, 1918, except during the period February 7 to May 9, 1918, when Maj. Holland M. Smith was brigade adjutant. On October 26, 1917, Brig. Gen. Charles A. Doyen, United States Marine Corps, assumed command of the Second Division as its first commanding general, and announced his staff in General Orders No. 1, with station at Bourmont, Haute-Marne, serving as such until relieved by Maj. Gen. Omar Bundy, United States Army, who announced that he assumed command in General Orders No. 4, November 8, 1917. Like the Fifth Regiment, the Sixth Regiment spent several months performing the necessary but undesired duties along the Line of Communications. On January 12, 1918, Col. Albertus W. Catlin established headquarters for the Sixth Regiment at Blevaincourt in the Bourmont training area. The Third Battalion arrived in this area on January 12, 1918, the headquarters units the same date, the First Battalion during January, 1918, and the Second Battalion on February 10, 1918. Therefore, on February 10, 1918, the Fourth Brigade of Marines was in the Bourmont training area intact, with the exception of one company on duty in England, training industriously as an infantry brigade of the Second Division. While the brigade had been organized on October 23, 1917, and had actually functioned as a brigade with elements of all three of its units present from January 12, 1918, it was not until February 10, 1918, that the Brigade organization was perfected. FIFTH BRIGADE OF MARINES. On September 5, 1918, the Major General Commandant directed the post commander, Marine barracks, Quantico, Va., to organize brigade headquarters of the Fifth Brigade, United States Marine Corps.