Horsemen and Musket Riders are faster.
—In-game description

Horse Secrets is a Big Button technology in Age of Empires III: The WarChiefs that is unique to the Haudenosaunee and can be researched at the Corral. Once researched, it increases the speed of cavalry by 10% and reduces cavalry training time by 35%.

With the Industrial Age Old Ways Home City shipment, the cost is reduced to 200 wood, 200 coin.

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