How to Combine Battalions
How can I merge battalions?
Only way to make a larger force would be to fire one of the generals, which would mean his troops would be allocated to the other generals in the HQ region.
Or just build more barracks in the HQ region to increase the number of battalions.
Having some small battalion generals can be useful for minor fronts which have low supply or smaller scale conflicts where you don’t want to raise everything.