The typical warship of the period of the Persian War was probably not more than eighty or a hundred feet long, narrow, and nearly flat-bottomed. At the bow and stern there was a strongly built deck. Between this poop and forecastle a lighter deck ran fore and aft, and under this were the stations of the rowers. The bow was strengthened with plates of iron or brass, and beams of oak, to enable it to be used as a ram, and the stem rose above the deck level and was carved into the head of some bird or beast. There was a light mast which could be rigged up when the wind served, and carried a cross-yard and a square sail. Mast and yard were taken down before going into action. The Greeks called their war galleys _triêres_, the Romans _triremes_, and these names are generally explained as meaning that the ships were propelled by three banks or rows of oars placed one above the other on either side. The widely accepted theory of how they were worked is that the seats of the rowers were placed, not directly above each other, but that those who worked the lowest and shortest oars were close to the side of the ship, the men for the middle range of oars a little above them and further inboard, and the upper tier of rowers still higher and near the centre-line of the ship. An endless amount of erudition and research has been expended on this question; but most of those who have dealt with it have been classical scholars possessing little or no practical acquaintance with seafaring conditions, and none of their proposed arrangements of three banks of oars looks at all likely to be workable and effective. A practical test of the theory was made by Napoleon III when his "History of Julius Cæsar" was being prepared. He had a trireme constructed and tried upon the Seine. There were three banks of oars, but though the fitting and arrangement was changed again and again under the joint advice of classical experts and practical seamen, no satisfactory method of working the superposed banks of oars could be devised.