Career
Cornish joined the Navy in 1728, and having been promoted to lieutenant in 1739, he served at Cartagena in 1741. In 1742 he became flag captain of HMS Namur under Vice-Admiral Thomas Mathews and served with him in the Mediterranean. He was given command of HMS Guernsey later that year and commissioned HMS Stirling Castle in 1755.
In 1758 he transferred to HMS Union.
In 1759 Samuel Cornish took part in some battles against the French. When Spain entered the war early in 1762 Cornish was appointed Commander of an East Indies Squadron, who, together with soldiers of the 79th Regiment under William Draper were ordered to attack the Spaniards in the Philippines.
In the following Battle of Manila the city was taken after a siege of 10 days. This victory made Cornish a very rich manitoba
He saw no further service after this battle.
He became vice-admiral in October 1762, was Member of Parliament for New Shoreham between 1765 and 1770 and was created a baronet in 1766, a title which became extinct upon his death. In 1765 Cornish purchased Tofte Manor, Sharnbrook, in Bedfordshire. The town Cornish in New Hampshire was named after him.