He designed a ship from the model of those used by the Greeks, Romans, and Carthaginians, similar to the Maltese galley employed down to a very recent date in the Mediterranean. His ships are said to have been twice as large as any vessels of war used by other nations at that period. They were large galleys, propelled by sixty oars, with a deck above that part where the rowers sat. On the deck stood the fighting men and mariners, who managed the sails, for they had masts and sails as well as oars. There were besides probably small towers or breast-works at the stern and bow to contribute to their means of attack and defence. These ships were built of well-seasoned materials, commanded by experienced officers, whom the king had collected from all quarters, and manned by expert seamen. The commanders were ordered to go forth in quest of the Danes, to attack wherever they encountered them, and to give no quarter; orders which were strictly obeyed, and which for the time were most efficacious in clearing the coast of pirates. In consequence of the ease with which the ships were moved through the water, and from their being always able to keep the weather-gauge, as likewise from the strange appearance which they presented to their enemies, Alfred's commanders were not afraid of attacking twice or thrice their own number of the enemy, and invariably came off victorious. Indeed they had nearly the same advantage over the Danes which a steamer at the present day has over a fleet of Chinese junks. Alfred, it is said, caused surveys to be made of the coasts of Norway and Lapland, and sent out ships to the polar regions in search of whales.