Leutnant Heinrich Georg Geigl was a World War I flying ace

Flying ace

A flying ace or fighter ace is a military aviator credited with shooting down several enemy aircraft during aerial combat. The actual number of aerial victories required to officially qualify as an "ace" has varied, but is usually considered to be five or more...

 credited with thirteen aerial victories.
Geigl was an elementary school teacher and a philosophy student in civilian life. Once trained as a pilot, he went through assignments with Kagohl 6 and Kasta 36. On 26 February 1917, he was assigned to Royal Bavarian Jagdstaffel 34. His first victory was on 29 April 1917; he became an ace with his fifth, on 10 August 1917. One week later, he was appointed to lead Royal Bavarian Jagdstaffel 17. Three days later, August 20, Geigl was wounded in action by small arms ground fire as he shot down a Caudron

Caudron

The Caudron Airplane Company was a French aircraft company founded in 1909 by brothers Gaston Caudron and René Caudron . It was one of the earliest aircraft manufacturers in France and produced planes for the military in both World War I and World War II...

. He would not score again until 18 March 1918; between then and 3 April 1918, he would shoot down six more British airplanes. On 4 April 1918, during a dogfight, he collided with a Sopwith Camel

Sopwith Camel

The Sopwith Camel was a British First World War single-seat biplane fighter introduced on the Western Front in 1917. Manufactured by Sopwith Aviation Company, it had a short-coupled fuselage, heavy, powerful rotary engine, and concentrated fire from twin synchronized machine guns. Though difficult...

. Geigl was killed and the Camel counted as his thirteenth win.

Reference

Above the Lines: The Aces and Fighter Units of the German Air Service, Naval Air Service and Flanders Marine Corps 1914 - 1918 Norman L. R. Franks, et al. Grub Street, 1993. ISBN 0948817739, 9780948817731.