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Siege Artillery
The invention of gunpowder in Sòng China has led to the development of a new device that employs its firepower in warfare: the artillery. These weapons pose a serious threat to stone-built castles and other fortifications.
ArtilleryInstitutionallowAdvance tree
The root of a tree in 
Reformation.
Modifiers
Definitionin_game/common/advances/0_age_of_reformation.txt:250
254depth = 0
255ai_weight = {
255add = 100
}