Advance
Defensive Army
The rise of many powerful states around us has hastened our need for a robust defensive force, as we intend to maintain our territorial integrity. Knowledge of our homeland's native terrain, hidden paths, and regional tactics will see us through this turbulent period.
Advance tree
The game files don’t say where this goes: it has no requires, so the game places it in the 
Reformation tree itself.
Modifiers
Definitionin_game/common/advances/4_choices_mil.txt:245
247icon = artillery_institution_advance
248for = mil