After the war Treat returned to his permanent rank of brigadier general and served as commander of Fort Stotsenburg, Philippines, remaining on active duty until retiring in 1922.[15]
In 1930 he was promoted to major general on the retired list.[16]
The President of the United States of America, authorized by Act of Congress, July 9, 1918, takes pleasure in presenting the Army Distinguished Service Medal to Brigadier General Charles G. Treat, United States Army, for exceptionally meritorious and distinguished services to the Government of the United States, in a duty of great responsibility during World War I. As Chief of the American Military Mission to Italy and Commanding Base Section No. 8, by his untiring devotion to duty, loyalty, and zeal, General Treat performed his intricate duties with marked ability and sound judgment. By his cheerfulness and sound diplomatic ability he furthered those cordial relations which existed between the American and Italian troops, and was an important factor in maintaining the morale at a high state of efficiency during the trying days prior to the armistice.[18]
Death and burial
Treat's former residence (left) in the Dupont Circle residence of Washington, D.C.
In 1889 Treat married Margaret Louise Cornell, the daughter of John Black Cornell, a wealthy New York City businessman.[21] She died in 1921, and he later married Edith Pennington, the widow of Lieutenant Colonel Godfrey MacDonald (1858–1918) and daughter of Alexander Cummings McWhorter Pennington Jr.[22]
Treat's son Joseph Bradford Treat, son-in-law Archibald Vincent Arnold, grandson Archibald Vincent Arnold Jr., and great-grandson Archibald Vincent Arnold III all graduated from West Point.[23]
