Every level brings two attribute points in two different tables. One point for STR or AGI, one point for INT or CHA.
Order: Skill Name - Type - Possible function
Looting - AGI - If raiding villages implements it can increase the loot.
Trainer(!) - INT - None as there are no NPC's.
Tracking - INT - We can see detailed information of parties on map as the skill goes up. We can see their path.
Tactics - Increases roster limit +1. Maybe there should be "Leave some of your soldiers to cover your retreat." option.
Path-finding - INT - We can move faster on map as the skill goes up.
Spotting - INT - We can see more on map as the skill goes up.
Inventory management - INT - Every skill of IM can increase the limit of items that you can carry on Strategus. Let's say 5000 per point. Also the idea that came into my mind is it can be for caravaning from city to city carrying 5000 woods for example.
Wound treatment - INT - There should not be fight until one side is "0". There should be captors, wounded people, deserters, rest of the army after retreating. This is the only way this skill can work. Let's say none for now.
Surgery - INT - After a successful charge you can save some of your death(!) soldiers back.
First aid(!) - INT - None.
Engineer - INT - Diff. requirement for siege weapons in-game. Like ladders.
Persuasion(!) - INT - None as there are no NPC's.
Prisoner management - CHA - Only if there's capturing prisoners. -lords and tickets-
Leadership - CHA - Increases the troop limit by 1000.
Trade - CHA - Let's talk about it after Strategus emonomy system. None for now.
In clans there are real scouts, raiders, generals, merchants, doctors as different classes and all this classes actually works for single purpose. So it sounds fun to me. Don't you agree?