Extra-state wars are either "colonial" (WarType 2) to maintain control of a particular colony or "imperial" (WarType 3) to extend an empire. Intra-state wars are classified as either a civil war for central control (WarType 4), a civil war over local issues (WarType 5) a regional internal war (WarType 6), or an intercommunal war (WarType 7). Non-state wars are classified by whether they take place in non-state territory (WarType 8) or across state borders (WarType 9).[2]