Overall you're much better off using Archers for that purpose however. Even if you fog bust, Barbarians can wander into your territory from elsewhere, especially if one of your neighbours managed to build the Great Wall. An Archer on a hill, especially if it's wooded, can be more than a match for anything that might come your way though. Even more so once it gains a level or more of Guerrilla. Of course they aren't quite as useful on flat land, but even still they have a higher hit point count than Warriors, and there's nothing early on that gets a bonus against. If a Warrior meets a Barbarian Axeman though, he's guarenteed to be toast.