Wagons like carriages are a horse drawn vehicles.
Background[]
In Daventry 'wagon length' is a way of measuring distance and space.[1] For example the massive iron doors leading into Sorrowing Court was wide enough to allow three wagons side by side to enter, and tall enough to pull in a house. Karn Megiddo also later knocks Dunstan a 'wagon length' away.
Castle Daventry has several wagons and a royal carriage, which are drawn by the horses of the castle's stable.[2] They have a large hay wagon which was pulled by a two horse team for bring hay to the castle to feed the horses in the stable.