Battalion Wars is a Nintendo GameCube war-game played with Real-Time Strategy controls. While unrelated to the Advance Wars series in the Western Hemisphere, in Japan it is known as Totsugeki!! Famicom Wars (Charge!! Famicom Wars) where it is a spin-off to the series.
From its conceptual stages Battalion Wars began as an original IP and not intended to be related to Advance Wars. However due to its similar "light-hearted" tone and graphic style, Nintendo at one point planned to connect the series as a spin-off and even first revealed the game under the title "Advance Wars: Under Fire". However, because of its otherwise unrelated gameplay elements and storyline, the title was changed prior to its release and the "Advance Wars" branding was abandoned in the West. The Japanese release however, did retain the "Famicom Wars" brand, making the Japanese release the only official connection between the two series.
The title has spawned a sequel on Wii known in Japan as Totsugeki!! Famicom Wars VS (Battalion Wars 2 in the West).