Germania is great battlewise. Once you have managed to build a nice army, that is. Losses do not have to be heavy, just avoid autoresolve most of the time, as already pointed out by Magraev.
The key to victory, in my opinion, is spearmen and chosen archers. Form a solid wall of phalanxes, position some units of chosen archers behind these, and some cavalry on the sides to make sure they don't get any nasty surprises. The spearmen can be reinforced with night raiders and berserkers, great units for making the enemy rout. This makes them particularly useful against your neighbours the Gauls and the Britons, as these guys rout at the drop of a hat. I have yet to see this strategy fail.
Where to go? In my opinion every Germania-player's duty is to plunder Rome before Alaric. Which gives you hundreds of years, so no need to hurry, conquer Britannia and Gaul first.
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