Both are very short and very old movies. In both, two species of anthromorphic animals fights with each other. While in Oira no Yakyuu their fight takes form of sport match, in Osaru no Sankichi: Totsugekitai their fight takes form of war.
Both are very short, one minute long movies from 1934/1936. Both are black and white and withou a dialogue. Both shows war between two animal species, monkeys and bears in Osaru no Sankichi: Totsugekitai and monkeys and octopuses in Osaru no Kantai.