AdvanceChanged this version
Pike and Shot
A new type of warfare has emerged on the battlefield: Pikemen form a defensive square, while arquebusiers fan out to the sides and front, retreating behind or inside the square in case the formation enters close combat.
Pike and ShotInstitutionallowAdvance tree
The root of a tree in 
Discovery.
Modifiers
Army Morale+0.25
Definitionin_game/common/advances/0_age_of_discovery.txt:419
421icon = pike_and_shot_advance
424depth = 0
425ai_weight = {
425add = 100
}