Idea by I-really-hope-not
Once before the clans, there were many small groups of cats that went into battles. They didn't actually fight on a forest, though, but instead a lake and river surrounded by moor and prairie. However, one day a kit was sent down by the heavens by the name of Tree. It was his job to make the forest. How? Well, Tree always bumped into trees, even where there were none. So trees would spawn in front of him do he could bump into them, through this embarrassing tactic, Tree completed the noble task of making the forest we see the clans in today.