When the service required, they were compelled to row incessantly night and day, without rest, save in the last extremity; and they were treated as if, on the first opportunity, in sight of the enemy, they would revolt and betray the ship; hence they were constantly watched by the soldiers on board, and if any commotion appeared amongst them, they were shot down without ceremony, and their bodies thrown into the sea. Loaded cannons were also placed at the end of the benches of rowers, so as to shoot them down in case of necessity. Whenever an enemy's ship came up, the galley-slaves were covered over with a linen screen, so as to prevent them giving signals to the enemy. When an action occurred, they were particularly exposed to danger, for the rowers and their oars were the first to be shot at--just as the boiler or screw of a war-steamer would be shot at now--in order to disable the ship. The galley-slaves thus suffered much more from the enemy's shot than the other armed men of the ship. The rowers benches were often filled with dead, before the soldiers and mariners on board had been touched. Marteilhe, while a galley-slave on board _La Palme_, was engaged in an adventure which had nearly cost him his life. Four French galleys, after cruising along the English coast from Dover to the Downs, got sight of a fleet of thirty-five merchant vessels on their way from the Texel to the Thames, under the protection of one small English frigate. The commanders of the galleys, taking counsel together, determined to attack the frigate (which they thought themselves easily able to master), and so capture the entire English fleet. The captain of the frigate, when he saw the galleys approach him, ordered the merchantmen to crowd sail and make for the Thames, the mouth of which they had nearly reached. He then sailed down upon the galleys, determined to sacrifice his ship if necessary for the safety of his charge. The galleys fired into him, but he returned never a shot. The captain of the galley in which Marteilhe was, said, "Oh, he is coming to surrender!" The frigate was so near that the French musqueteers were already firing full upon her. All of a sudden the frigate tacked and veered round as if about to fly from the galleys. The Frenchmen called out that the English were cowards in thus trying to avoid the battle. If they did not surrender at once, they would sink the frigate!