In World War I, Gotha was the manufacturer of a highly successful series of bombers based on a 1914 design by Oskar Ursinus, but heavily reimagined by Hans Burkhard. From 1917, the Burkhard-designed twin pusher biplane bomber aircraft were capable of carrying out strategic bombing missions over England, the first heavier-than-air aircraft used in this role. Several dozen of these bombers were built in a number of subtypes - the Ursinus-based Gotha G.I, and the succeeding Burkhard-designed G.II, G.III, G.IV, and G.V. This last variant was the most prolific, with thirty-six in squadron service at one point.