The Caudron G.4 was a French biplane with twin engines, widely used during World War I as a bomber aircraft. It was designed by Rene and Gaston Caudron as an improvement over their Caudron G.3. The aircraft was no delight for the eye with its massive, open construction. The aircraft employed wing warping for banking.
The first G.4 was manufactured in 1915, both in France, England and in Italy. The G.4 was in use in Belgium, France, Finland, Italy, UK, and in the United States.
The Caudron G.4 was used as a reconnaissance bomber into the heart of Germany. Later, when Germany developed a fighter force, the aircraft had to be used for night bombings.