Even a simple drunkard can start a war. In fact, it's really common for one simple drunk person to offend an entire country into declaring war.
Welp, you woke up this morning and now you're at war with the centaurs (せん). This is especially unfortunate, because the centaurs are really good at battles because they're all automatically cavalry troops.
Currently there are no similar looking kanji which exist in the WaniKani learning system