I was just thinking about it wheather the troops would be drawn from a peasant rescource
This is sort of how Orcs work in-game. Orc player get a slow income of free Orc units. You can choose for these free Orc units to wield a bow and knife and be a hunter/food gathering unit, or a laborer unit - for gathering other resources, and building.
And majority of Orcish troops (not counting Ogres, Goblins or various beast units) will be drawn from these free Orc "peasants."
For example you select a bunch of these free Orcs, task them into one of the Orc War buildings - and they`ll be given right weapons there to become a certain type of military units (depending on the building you task them in). After you give them weapons and turn them into soldiers, you can choose to task them into one of the beast building - to get them to become mounted units, or task them into the temple, to further train them to a 2nd level military units.
So you can say that with Orcs - these free Orc peasants are a resource.