Maxing out medicine early (focus and attribute points) and by just simply battling and sieging. Offensive siege's are great once you get siege medic because most losses just become injuries. Doctors oath really helps a lot too. Siege defenses are the best for building medicine quick. Having all high tier troops is a must because they give the most medicine xp gain. My army composition is all Fian champs and high tier infantry (any faction). In the mid game just be accustomed to some infantry losses cause it only makes you stronger in the end. But you don't need to carelessly sacrifice troops in order to get there. You can easily get there in the normal course of battling.How do you do this?