A royal post service was established by relays of mounted messengers. The first route was between London and the Scottish border, where there were frequent battles for land between the Scotch and English. The inland roads from town to town were still rough and without signs. A horseman could make up to 40 miles a day. Common carriers took passengers and parcels from various towns to London on scheduled journeys. Now the common yeoman could order goods from the London market, communicate readily with friends in London, and receive news of the world frequently. Trade with London was so great and the common carrier so efficient in transporting goods that the medieval fair began to decline. First the Grocers and then the Mercers refused to allow their members to sell goods at fairs. There was much highway robbery. Most goods were still transported by boats along the coasts, with trading at the ports. Embroidery was exported. Imported were timber, pitch, tar, potash [for cloth-dying], furs, silk, satin, gold cloth, damask cloth, furred gowns, gems, fruit, spices, and sugar. Imports were restricted by national policy for the purpose of protecting native industries. English single-masted ships began to be replaced by two or three masted ships with high pointed bows to resist waves and sails enabling the ship to sail closer to the wind. 200 tuns was the usual carrying capacity. The increase in trade made piracy, even by merchants, profitable and frequent until merchant vessels began sailing in groups for their mutual protection. The astrolabe was used for navigation by the stars. Consuls were appointed to assist English traders abroad. Henry IV appointed the first admiral of the entire nation and resolved to create a national fleet of warships instead of using merchant ships. In 1417, the war navy had 27 ships. In 1421, Portsmouth was fortified as a naval base. Henry V issued the orders that formed the basic law of English admiralty and appointed surgeons to the navy and army. He was the last true warrior King. For defense of the nation, especially the safeguard of the seas, Parliament allotted the king for life, 3s. for every tun of wine imported and an additional 3s. for every tun of sweet wine imported. From about 1413, tunnage on wine and poundage on merchandise were duties on goods of merchants which were regularly granted by Parliament to the king for life for upkeep of the Navy. Before this time, such duties had been sporadic and temporary. The most common ailments were eye problems, aching teeth, festering ears, joint swelling and sudden paralysis of the bowels. Epidemics broke out occasionally in the towns in the summers. The plague swept London in 1467 and the nation in 1407, 1445, and 1471. Leprosy disappeared.