Defensive war by sea. [electronic resource] : In five parts. I. Shewing how to prepare a ship for a close fight, by ordering their bulk-heads, leaves, coamings, lookholes, in rouls, false ports, portcullesses, &c. and taking the running rigging into the close quarters. II. An epitomy of the art of gunnery; shewing how to find the defects of cannon, what quantity of powder a gun requires, true or false bored, and to find the dispart of a gun true or false bored, and to prepare powder-chests, powder tubs, &c. III. Chasing; where the advantages to be taken by the chase are considered, under all prositions, in respect to the wind and tide. IV. Desentive fighting; shewing how merchant-ships, whether single or in fleets, are to act, when cannonaded or boarded by an enemy, and how to anchor under the protection of their convoy. V. Fortifying ships in a harbour, shewing how to erect batteries upon the land; the advantages of moaring, in respect to the wind and tide, considered: how to lay booms in strait or crooked rivers; and what maxims are to be observed by commanders, before they moar their ships. By Robert park of Ipswich, mariner.