After his initial assignment to the 3rd Artillery, March was assigned to the 5th Artillery as a 1st lieutenant in 1894. He was sent to the Artillery School at
Fort Monroe, Virginia in September 1896 and graduated in April 1898, at the outbreak of the
Spanish–American War. As he was not immediately assigned, he watched as his classmates went off to various commands, and began fearing he would not see combat. In early May, that changed when he was offered to lead what later became known as the Astor Battery, named so because it was personally financed by
John Jacob Astor IV. He organized, equipped and subsequently commanded the battery when it was sent to the
Philippines during the
Spanish–American War. Historian Bruce Campbell Adamson has written about Henry Bidwell Ely (Adamson's great grandfather) who was placed in charge of The Astor Battery by John Jacob Astor IV, to give Peyton March whatever he needed. March credited Ely as having "an open check book" to purchase uniforms, mules and the cannons. After the battery returned from the Philippines in 1899, March was assigned as the aide to Major General
Arthur MacArthur, Jr. during the
Philippine–American War. Later that year he was promoted to major. He continued to serve in the Philippines, participated as part of General
Loyd Wheaton's expedition in battles at
San Fabian, Buntayan Bridge and San Jacinto. He commanded the U.S. forces in the
Battle of Tirad Pass, 2 December 1899, where General
Gregorio del Pilar was killed, and received the surrender of General
Venacio Concepción, chief of staff to Philippine President
Aguinaldo at
Cayan, 5 December 1899. He served as provincial governor of districts including
Lepanto-Bontoc and Ilocos Sur from February to June 1900, and then the
Abra Province from June 1900 to February 1901. He then served as
Commissary General of
Prisoners for the
Philippine Islands through 30 June 1901, when he mustered out of the
U.S. Volunteers. In 1903, he was sent to
Fort Riley and commanded the 19th Battery of the
Field Artillery. Later that year, he was sent to
Washington, D.C., and served on the newly created
General Staff. From March 21 to November 30, 1904, March was one of several American
military attachés serving with the
Imperial Japanese Army in the
Russo-Japanese War. In 1907, March commanded the 1st Battalion,
6th Field Artillery. March then served as
adjutant of
Fort Riley, Kansas and then served as adjutant at several other commands, including at the War Department. In 1916, he was promoted to colonel and commanded the 8th Field Artillery Regiment on the Mexican border during the
Pancho Villa Expedition. ==Later career==