The prototype G.4 first flew in March 1915, and 1,358 were built in three major versions: the Caudron G.4A2 for reconnaissance, the G.4B2 for bombing, and the G.4E2 for training.
Caudron G.4
Caudrons were used extensively by British and Italian units, and a few were used by the Russians and the Belgians. Ten Caudron G.4s were sold to the United States in November 1917 and transferred to the U.S. Air Service's 2nd Air Instruction Center at Tours. Used exclusively as trainers, none of these Caudrons saw operational service with American units.