Another oddball from Giant Canada World:
The WNF Wn-15 is a pre-Great World War fighter produced by the Meindl design team out of Wiener Neustadt Flugzeugwerke in Vienna. Obsolete and phased out of all but training and support roles in the KUK Luftfahrtruppen by the time the war starts, the design is nevertheless still used by various Central Pact clients in Eastern Europe, usually those carved out of Russia and Prussia after the Continental War of the late 1890s and early 1900s. This one serves with the Royal Circassian Guard Flying Corps and is one of just a couple dozen Wn-15s flying for the small country when Russia invades early in the war.
This design is one of the last to use the quixotic stepped-T tail design Meindl/WNF likes in the biplane years.