The Mantlet has high health, acceptable range, decent attack resistance, but a semi-weak attack. Due to their survivability, Mantlets excel at destroying military and economic buildings. However, in order to use Mantlets properly, a sufficient range between their target must be established. Due to their high health Iroquois Mantlets are also good against defensive buildings, ranged units, and artillery.
With some boost from the War Chief, the Iroquois Mantlet can have over 1000 hitpoints with all upgrades. This allows them to be very effective when deployed in numbers as cannon fodder for protecting units that are weak against ranged damage. With the Siege Discipline shipment their population cost is dropped to only 1 which makes mass production of this unit very easy.
Because the Iroquois often fortified their towns, they needed siege weapons when they went to war with rival towns. One technique they developed was the mantlet, similar in function to those used in Roman and medieval armies. Two warriors would carry the mantlet (essentially a moveable wooden wall) to protect themselves from enemy arrow or musket fire until they reached their enemy's town walls, where the mantlet was used as a ladder to scale the walls and breach the town. Canoes could also be used as shields and ladders, although canoes used for assaulting a fortress were not always the best paddling vessels after the fighting was over.