Once the agreement was made, the crusaders and Venetians began boarding the ships. The crusaders used the 50 amphibious transports, 100 horse carriers and 60 warships designed and built for them by the Venetians. Their transports were approximately 30 m long, 9 m wide and 12 m high, with a crew of 100. Each one could carry up to 600 infantry. The horse carriers featured specially designed slings to carry their cargo of horses, and featured a fold-out ramp below the waterline that could be opened to allow mounted knights to charge directly onto shore. The Venetian warships were powered by 100 oarsmen each and featured a metal-tipped ram just above the waterline as their primary weapon. They also carried more than 300 siege weapons.