Advance
The Hills Speak Celtic
Centuries of living under the shadow of conquest have taught our warriors the art of patience and resilience. We can rush headlong into danger, but we can also endure, defend, and strike only when the moment is right.
CelticaFormable CountrypotentialAdvance tree
The game files don’t say where this goes: it has no requires, so the game places it in the 
Traditions tree itself.
Modifiers
Fort Defense+10%
Definitionin_game/common/advances/culture_irish.txt:185
188icon = alpine_defensiveness