Just a tip, but if you ever happen to find barbarians in your territory (away from where the AI will find them), you can easily up the promotions of your units. After killing one of the two barbarian units in a village, another will spawn in 2-3 turns. The number of flags will indicate how many are present. So, just park your unit outside the village and wait until 2 are present again. Attack and repeat. With this method I created a warrior army with 6 promotions using two barbarian villages in the demo. I would imagine when playing as the Germans that this would be a HUGE benefit. Happy hunting.