If you have a decent pc, you might look into the Band of Brothers mod, if it's still being supported. I found it on nexus, if I recall correctly. It requires Amazing Follower Tweaks, Universal Follower Overhaul, or one of the other multiple followers mods to run, but it gives you like 4 Imperial officer followers, each of whom has 5 followers of their own. With your normal follower, you can run around with like 25 troops, and then add Serana, Delphine and Esbern, et al., to that. Good times.