Burgundians can outfit their castles with crenellations in the 15th century. The effects of this technology are twofold. First, it gives castles +3 range-- better than the standard castle's fully upgraded range (11) and equivalent to the range of a fully upgraded Teutonic castle. Second, it grants extra arrows to any castle or tower with infantry units garrsioned inside, at the same rate as if an equal number of peasants were garrisoned.
Available to: Burgundy
Researched at: Castle
Cost: 600 Food, 400 Stone
Effect: Castles +3 range, garrisoned infantry can shoot arrows.