So this is TROM 1.0.
(If you were playing a campaign with the previous version, check the TROM previous version page.)

Even many things are changed from the beta version.

The biggest change is that unit recruiting is completely new.
It is no longer affected by the faction progression unlike the previous version.

There are five types of each major settlements. Metal, Wood, Water, Fire, Earth. Upgrading a city unlocks units of that type. This is shown in the game as a UI, so you will easily notice.

Now all classes can unlock the formation except Testudo, Square, Circle. They are unlocked from only strategists.

Also, if there are enough military supplies, 2~3 siege towers are created per item when the siege battle.