 Occasionally the mizzen mast of a ship-rigged ship would have a fore-and-aft sail as its course sail (top image), but in order to qualify as a "fully rigged ship" the vessel would need to have a square-rigged topsail mounted above this (thus distinguishing the fully rigged ship from, say, a barque—see above).The classic "ship rig" (top) originally had exactly three masts, but later, four- and five-masted ships were also built (bottom).The classic sailing warship—the ship of the line—was "full rigged" in this way, because of high performance on all points of wind.