Siege Workshop units are faster.
—In-game description

Siege Drill is a Big Button technology in Age of Empires III: The WarChiefs that is unique to the Haudenosaunee and can be researched at the Siege Workshop. Once researched, it increases the speed of Rams, Mantlets, and Light Cannons by 10%.


Siege Drill is of a vital importance to keep a Haudenosaunee army moving quickly.

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