A step up from the sand schooner, the sand galley is specifically designed as a warship. It has sufficient deck space to accommodate three heavy catapults or six ballistas or light catapults. Much of the vessel’s cargo space is often used for troops rather than for stores or merchandise. Like a sand schooner, a sand galley has one bulkhead on either side of the hull that opens downward to act as a ramp - in this case, facilitating the swift deployment of soldiers. A sand galley moves 1 to 3 miles per hour, depending on the wind, and requires flat, open sand on which to travel.