We have now to pass over a gap of several hundred years, during which time there is little or no information available about the ships belonging to these islands, the greater part of which, as a matter of fact, had become a province of the Roman Empire. There seems to have been a "Classis Britannici", or British squadron, but this was entirely a Roman organization, and had as much to do with the north of France--or Gaul--as Britain. The remains of an old ship--just the keel and lower ribs--which were not long ago unearthed on the right bank of the Thames, just below Westminster Bridge, are considered likely to have belonged to a galley of this squadron, and we know that there was a legion of what we may term British Marines, who formed the fighting portion of the fleet. Tiles have been found at Dover and other known stations of the Romano-British Fleet which bear the following inscription: "C.L., B.R.", which the experts in such matters interpret as standing for "Classiarii Britannici"--that is to say, "British troops trained for sea-warfare". We are also told by Vegetius, the old writer I have already quoted, that the badge of these troops was a "circle", which, by the way, is a somewhat curious coincidence, since that of the Marines of our own day is a globe. These were the men who defended the shores of our island against the growing numbers of pirates from northern Europe, for the rowers of the Roman galleys were merely the machinery of propulsion, and were probably much less considered than the steam-engines of a modern battleship. These troops also manned part of the wall built from the North Sea to the Solway in the vain attempt to keep out the Picts and Scots, for traces of them are to be found at Bowness at its western end. The North Sea pirates, then generally referred to as Saxons, became such a menace that the East Coast received the name of "The Saxon Shore", and a "count" or high official was specially appointed to take charge of its defence. [Illustration: Shield carried by the Soldiers of the "Legio Classis Britannici" (_From a coloured drawing in the Bodleian Library_) The centre of the shield is quartered red and white: the rim is white, and the remainder green.]