The first Gunpowder Infantry units to become available are Arquebusiers, which upgrade from the now-obsolete Light Infantry. They are somewhat mobile, but slow-firing infantry units with low armor, effective in fighting the slow-moving Heavy Infantry, Artillery Weapons and Support Units - as well as Foot Archers, which are still in service at this point. Gunpowder Infantry units are also somewhat effective against Ranged Cavalry. The damage bonus increase they receive when fighting Heavy Infantry, compared with that of the previous Light Infantry they replace, makes the upgrade worthwhile, despite its cost.