 Before any troop transportation could be undertaken, all of the ships had to be hastily refitted. Of the fourteen ships, four, including El Occidente, were designated to carry animals and cargo; the other ten were designated to carry human passengers. The four ships designated to carry animals had to have ramps and stalls built. All the ships had to have gun platforms installed, before each ship docked at the Brooklyn Navy Yard to have the guns themselves installed. All the ships were manned by merchant officers and crews but carried two U.S. Navy officers, Navy gun crews, quartermasters, signalmen, and wireless operators. The senior Navy officer on board would take control if a ship came under attack.
