Forecastles and stern castles on ships were lower and broader. Underneath them were cabins. The English ship was still single-masted with a single square sail. A navy was formed with over 200 ships selected by the English admirals acting for the King at the ports. Men were seized and pressed into service and criminals were pardoned from crimes to become sailors in the fleet, which was led by the King's ship. They used the superior longbow against the French sailor's crossbow. In 1372, the Tower of London had four mounted fortress cannon and Dover had six. The war's disruption of shipping caused trade to decline. But the better policing of the narrow seas made piracy almost disappear. In 1363, Calais, a continental town held by the English, became the staple town for lead, tin, cloth, and wool and was placed under a group of London capitalists: the Merchants of the Staple. All exports of these had to pass through Calais, where customs tax was collected. Merchants who took cloth abroad to various places to sell, personally or by agents, were called merchant adventurers to distinguish them from the Merchant of the Staple. Waterpower was replacing foot power in driving the mills where cloth was cleaned and fulled [thickened]. A boundary dispute between two barons resulted in the first true survey map. Nine cow pastures were divided by a boundary marked by a shield on a pole which the commission of true and sworn men had set up. Bethlehem Hospital was used from 1377 to house the mentally ill. The Law After the Black Death of 1348 these statutes were enacted: High treason was defined by statute in 1352 as levying war against the King, aiding the King's enemies, compassing or imagining the death of the King, Queen, or their eldest son and heir, or violating the Queen or the eldest unmarried daughter or the wife of the King's eldest son and heir, making or knowingly using counterfeits of the King's great or privy seal or coinage, or slaying the Chancellor, Treasurer, or any justice in the exercise of their duty. The penalty was forfeit of life and lands. During the reign of King Richard II, who was later disposed, high treason was extended to include making a riot and rumor, compassing or purposing to depose the King, revoking one's homage or liege to the King, and attempting to repeal a statute. But these extensions were repealed after he was deposed. Petit treason was defined by statute and included a servant slaying his master, a wife her husband, or a man his lord, to whom was owed faith and obedience. No one shall tell false news or lies about prelates, dukes, earls, barons, and other nobles and great men or the Chancellor, Treasurer, a Justice, Clerk of the Privy Seal, Steward of the King's house whereby debates and discords might arise between these lords or between the lords and the commons. Cases shall be tried by the King's Council, which included the Chancellor, Treasurer, and chief justices.