Meantime, although so little progress had been made at Ostend, Maurice had thoroughly done his work before Grave. On the 18th September the place surrendered, after sixty days' siege, upon the terms usually granted by the stadholder. The garrison was to go out with the honours of war. Those of the inhabitants who wished to leave were to leave; those who preferred staying were to stay; rendering due allegiance to the republic, and abstaining in public from the rites of the Roman Church, without being exposed, however, to any inquiries as to their religious opinions, or any interference within their households. The work went slowly on before Ostend. Much effect had been produced, however, by the operations of the archduke's little naval force. The galley of that day, although a child's toy as compared with the wonders of naval architecture of our own time, was an effective machine enough to harass fishing and coasting vessels in creeks and estuaries, and along the shores of Holland and Zeeland during tranquil weather. The locomotive force of these vessels consisted of galley-slaves, in which respect the Spaniards had an advantage over other nations; for they had no scruples in putting prisoners of war into chains and upon the benches of the rowers. Humanity--"the law of Christian piety," in the words of the noble Grotius--forbade the Hollanders from reducing their captives to such horrible slavery, and they were obliged to content themselves with condemned criminals, and with the few other wretches whom abject poverty and the impossibility of earning other wages could induce to accept the service. And as in the maritime warfare of our own day, the machinery--engines, wheels, and boilers--is the especial aim of the enemy's artillery, so the chain-gang who rowed in the waist of the galley, the living enginry, without which the vessel became a useless tub, was as surely marked out for destruction whenever a sea-fight took place. The Hollanders did not very much favour this species of war-craft, both by reason of the difficulty of procuring the gang, and because to a true lover of the ocean and of naval warfare the galley was about as clumsy and amphibious a production as could be hoped of human perverseness. High where it should be low. Exposed, flat, and fragile, where elevation and strength were indispensable--encumbered and top-heavy where it should be level and compact, weak in the waist, broad at stem and stern, awkward in manoeuvre, helpless in rough weather, sluggish under sail, although possessing the single advantage of being able to crawl over a smooth sea when better and faster ships were made stationary by absolute calm, the galley was no match for the Dutch galleot, either at close quarters or in a breeze.