In the Middle Ages, boats were used to transport horses over long distances, both for war and for trade.
[4] Sailing transports, known as usciere in Italian (French huissiers; Latin usserii), were also built.
For example, the Scandinavians had adapted the horse-transport technology by the 12th century as part of their move away from the traditional Viking infantry.
[6] The first illustration displaying such horse-transport in western Europe can be found in the Bayeux Tapestry's depiction of the Norman conquest of England.
[12] Adapting a ship for horse transportation required the installation of stalls of wood or hurdles.
[13] Whether English vessels used canvas slings to support the horses like contemporary Mediterranean practice is uncertain.