At Fort Niagara, situated on the bleak shores of the River Niagara, New York State, the nucleus of the first commissioned personnel of Battery D assembled, after enlistment, during the month of May, 1917, and began a course of intensive training at the First Officers' Training School, finally to be commissioned on August 15th in the Field Artillery Reserve. On August 13th, pursuant to authority contained in a telegram from the Adjutant General of the Army, a detachment of the Reserve Officers from the Second Battery at Fort Niagara were ordered to active duty with the New National Army, proceeding to and reporting in person not later than August 29th to the Commanding General, Camp Meade, for duty. A day's brief span after their arrival at Camp Meade--while the officers, who were the first of the new army units on the scene of training, were busily engaged in dragging their brand new camp paraphernalia over the hot sands of July-time Meade,--the dirt and sand mingling freely with the perspiration occasioned by the broiling sun,--to their first assigned barracks in B block, an order arrived on August 30th, assigning the officers to the various batteries, headquarters, supply company, or regimental staff of the 311th Field Artillery, that was to be housed in O block of the cantonment. Captain Albert L. Smith, of Philadelphia, Pa., was placed in command of Battery D. Other assignments to Battery D included: First Lieutenant Arthur H. McGill, of New Castle, Pa.; Second Lieutenant Hugh M. Clarke, of Pittsburgh, Pa.; Second Lieutenant Robert S. Campbell, of Pittsburgh, Pa.; Second Lieutenant Frank F. Yeager, of Philadelphia, Pa.; Second Lieutenant Frank J. Hamilton, of Philadelphia, Pa.; Second Lieutenant Berkley Courtney, of Fullerton, Md. Lieutenant-Colonel Charles G. Mortimer was placed in command of the regiment on August 28, 1917. He remained in command until January 17, 1918, when Colonel Raymond W. Briggs was assigned as regimental commander. Both are old army men and were well trained for the post of command. On March 31st, Col. Briggs, who had been in France and returned to take command of the 311th, was again relieved of command, being transferred to another outfit to prepare for overseas duty a second time. Lieut. Col. Mortimer had charge until June 10th, 1918, when he was promoted to Colonel, remaining in command until the regiment was mustered out of service.