Following his graduation from USMA, Judson then attended the
Army Engineering School of Application, which he graduated from in 1891. Following that, he served as an assistant engineer in various postings; at
Lake Erie, on the upper
Mississippi River, and in
Galveston, Texas. Following that, Judson served in a variety of engineering capacities until 1917. Notable postings included that as an instructor at the
U.S. Army Engineer School, as the Engineer Commissioner for
Washington, D.C., and as the Assistant Division Engineer for the Atlantic side of the
Panama Canal. Judson also was sent as a military observer to the
Russo-Japanese War from 1904 to 1905, when he returned to the US as a result of the Russian defeat. From 1905 to 1909, he supervised maintenance and improvement of harbors and lighthouses on the western shore of
Lake Michigan. During this time, he also received an honorary M.A. from Harvard in 1911. On April 6, 1917, the day of the
American entry into World War I, Judson returned to Russia as part of Root Mission, headed by
Elihu Root. Following Root's return to the U.S. three months later, Judson remained in Russia as head of the Root Mission itself before being detached as a military attaché to the American embassy in
Petrograd and chief of the American military mission to Russia until Spring 1918. Upon his return, Judson was placed in command of the
38th Infantry Division at
Camp Shelby until August 1918. From September to December 1918, Judson commanded the
New York Port of Embarkation. For his services during the war he was awarded the
Army Distinguished Service Medal, the citation for which reads: Judson spent the remainder of his career working as the district engineer in
Chicago, Illinois, retiring in August 1922 due to disabilities. == Personal life ==