Edwards was promoted to the rank of brigadier general on August 8, 1918. He went to France because of World War I and organized and commanded the Machine Gun Training Center, receiving the Army Distinguished Service Medal for his work. The model's citation reads as follows:
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 Oliver Edwards, 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. Due to his rare ability and high professional attainments, General Edwards was selected to organize the Machine-Gun Training Center, the success of which was, in a large measure, due to his zealous and energetic administration.[2]
With the war over, and after returning to the U.S., Edwards reverted to his permanent rank of colonel and became a student at the General Staff College. He also worked in the intelligence division of the United States Department of War's general staff.
Edwards died, at the young age of 51, on February 25, 1921.