Halberstadt D IV
The D.IV was the final single-seat fighter model produced by the Halberstadter Flugzeug-Werke in 1917. The Halberstadt D.I and D.II models were originally produced in 1916, and while they were maneuverable and enjoyed a period of superiority over the available Allied aircraft of the time, they were reported to be somewhat underpowered. Original public domain image from Flickr