 On 4 August, he joined KEK B under the command of Hans Bethge.From there, on 22 August, Keudell became a founding member of Jagdstaffel 1, destined to fly successively a Fokker D.I, a Halberstadt D.III and an Albatros D.III for them.On 31 August 1916, he shot down a Martinsyde Elephant for his first win.