Dogs......bowmen and cavalry
There are way too many dogs in the medium and hard camps. There are so many in fact, that bowmen and cavalry are useless. It is too expensive to build cavalry in the numbers needed to counter dogs. Therefore there is no point ever making cav or bowmen once you have cleared out the easy camps.
Either dogs need to be changed and/or most removed, or cavalry needs to be a heck of alot easier to build. until then, spam Recruits and militia. dont bother with the cav or bowmen.