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As a Gaul, your first troop, the Phalanx, leaves a little to be desired. Compared to the Romans and Teutons, it is much more difficult to raid with a Phalanx or make any truly offensive moves. That does not mean that you can't raid with it - you can and you should, it is just less effective than your opponents starting troops. This is more than made up for by the Gaul's next raiding unit: the Theutates Thunder. By far the fastest unit in the game, the Theutates Thunder will expand your raiding zone by three whole screens or more, and strike fear into the hearts of any Teutons who have failed to upgrade to spearmen quickly enough. While you'll start out weak with just your phalanx, if you use your defenses and raid intelligently, you can easily overtake your neighbors with Theutates Thunder.
What's more, your next two cavalry units, the Druidrider and the Haeduan, are both excellent defenders, allowing you to create a fast, powerful defensive army that is the envy of all your opponents. The Haeduan is also a powerful attacker and decent raider, giving the expensive unit a versatility that more than makes up for its price. You will also find that as time goes on, the phalanx, while still ineffective at attacking, are a cheap and powerful defense. So while the Gaul army starts off relatively weak, it soon grows to become quick and deadly, and extremely effective in mid- and endgame wars.