In her he remained until the breaking out of war between England and France in 1756, when, considering the risk he ran of being pressed, he volunteered as an able seaman on board the _Eagle_, of sixty guns, commanded by Captain Harmer, who was succeeded by Captain Palliser, afterwards Sir Hugh Palliser, Cook's warm and constant patron. He had by this time many friends on shore, and his captain, who having remarked his intelligence and assiduity, had already made him a quartermaster, received a letter recommending him to his notice, and in a short time obtained for him a warrant as master. In 1759 Cook was accordingly made master of the _Grampus_, but the former master returning, he was appointed to the same rank on board the _Garland_. He was again doomed to disappointment, as she had sailed, but quickly received an order appointing him to the _Mercury_, which immediately sailed for North America, to join the fleet under Sir Charles Saunders, which, in conjunction with General Wolfe's force, was engaged in the siege of Quebec. He was here employed, by the recommendation of Captain Palliser, who now commanded the _Shrewsbury_, in taking soundings in the Saint Lawrence opposite Quebec. While thus occupied he had a narrow escape of being captured by the French. After this he had many opportunities of displaying his talents, while he applied himself diligently to the study of astronomy and other branches of nautical science. While serving on board the _Northumberland_, he was engaged in the capture of Newfoundland, and was afterwards employed, at different periods, in surveying its coast. At the end of 1762, returning to England, he married Miss Elizabeth Batts, a young lady of respectable family. By her he had six children, three of whom died in their infancy. His last visit to Newfoundland was as marine surveyor, in 1767. After the establishment of peace between England and France, two expeditions had been fitted out to circumnavigate the globe, one under Lord Byron, and the other under Captains Carteret and Wallis. Before the return of the latter commanders, a new expedition was designed for the purpose of observing the transit of Venus, which had been calculated by astronomers would occur in 1760. Various parts of the Pacific were talked of as most suitable; but before the expedition was ready, Captain Wallis returned and recommended King George's Island or Otaheite as the most eligible situation for observing the approaching transit. After various persons had been proposed to command the expedition, the Secretary of the Admiralty named Cook; and Sir Hugh Palliser, who was applied to, strongly recommending him, he was at once appointed.