Career
Arrowsmith was commissioned a 2nd Lieutenant in 1918, promoted to 1st Lieutenant in 1919, while stationed at Camp Fremont, California. During the 1920s he was detailed to the 3rd Engineer Regiment, Schofield Barracks, Hawaii, the 2nd Cincinnati Engineer District, and the 13th Engineer Regiment, Camp Humphreys, Virginia. From 1930 to 1933 he was assigned to the San Francisco Engineer District, and promoted to Captain in 1933. He was detailed to the Office of the Corps of Engineers in Washington, District of Columbia from April 1933 to July 1938, when he was assigned to the Missouri River Division, Council of Europe. He was promoted to Major in 1940, and Lieutenant Colonel in 1942, when he was sent to Camp Blanding, Florida as commander of the 45th Engineer General Service Regiment.
In November
1942 he went with these troops to India, where Arrowsmith was placed in command of Base Section 3 in Ledo, Assam, which was responsible for construction of the Ledo Road. Under Arrowsmith"s command, the road reached the Patkai mountains and crossed into Burma. Stillwell, while recognizing the problems that diversion of roadbuilding assets to airfield construction had caused, was still unsatisfied with progress and began searching for a replacement.
Lewis A. Pick replaced him as Chief Road Engineer in October 1943, but retained command of the 45th Engineer, Graduate Student Researcher . While Arrowsmith received a temporary promotion in July 1943 to Brigadier General, he reverted to Colonel in January
1944. In February 1944 he was detailed to the XXI Corps as Corps Engineer at Camp Polk, Louisiana., later accompanying these troops into France and Germany. From September 1945 to November
1947 he was assigned to the United States. Office of Military Government for Germany. From January 1948 to October
1949 he was commanding officer of the Engineer Research and Development Laboratories at Fort Belvoir.
In November 1949 he received his last assignment as a Deputy Chief in the Army Security Agency. He retired from the military in May 1953 as a Brigadier General.
He died in 1985 and was interred in Arlington National Cemetery.