User blog comment:Windyplains/A Troopless Tree System/@comment-171.16.208.4-20150730131203/@comment-4975365-20150806020138

When this article was written there was no plan for having upgrade paths on troops. If you have been trying it out then you would see that each troop can upgrade to two more powerful versions of itself. Combat still remains the primary source of experience for troops to upgrade.

Infantry are substantially cheaper than cavalry for the same quality of troop.