The Corvun military has been largely weak for its entire existence up to 1908. Before this they havent seen many wars, but their last war was a disaster and resulted on their loss of Southern Corvus to Cetus. Due to the following instabilities caused by this, the army was sent to control the city street. Which backfired on the goverment because troops instead did the same crimes civilians were (as well as coruption)

In 1905, the King ordered for Modernization of the army as well as mobilization of troops to prepare for war. The problem was the army was quite small. The King decided to use propadanda and acuse Cetus of destroying their society. This convinced many people to sing up in the army. By 1908, the corvun army had 4 times the number of troops it did in 1905. (Btw most soldiers were either civilians, criminals, or gans members who wanted revenge on Cetus)

After years of battle, by mid 1910, poison gas was used agasint the cetans, which allowed Corvun troops to take land with little resistance. But they still struggled. With Anterean troops advancing south and Corvus having destroyed the armies in the north, Corvus retook Southern Corvus

(Btw it was know Corvun troops sometimes killed innocent civilians as human sacrefice for their gods)