Well, you're making a mistake when you handle it that way.
To get new soldiers you are supposed to make new weapons.
Gather iron ore and coal. Build an iron smelter where he makes steel from iron ore and coal.
You need to have an armory as well. He again crafts arms and shields out of ore and steel.
These are delivered to the hq and indefinite helpers turn into soldiers if there is a need for them.
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