He stepped up inspections by officers, segregated the Royal Marines from the seamen, banned the use of the Irish language and kept his jaundiced, un sleeping eye on every new ship that arrived. When two men were convicted of mutiny one Saturday, he had them hung (sic) the next morning, despite one admiral protesting that he was profaning the Sabbath; St Vincent had him recalled. When the men of HMS Marlborough refused to hang a mutineer, St Vincent sent armed boats to surround the ship and prepare to fire; the Marlborough's men hauled their shipmate up to meet his maker at the end of the yard arm.
The ferocity of Jervis's discipline was carefully calculated to meet the demands of the moment: Britain was facing an ideological as well as a military threat, and those who spread subversion and indiscipline were a fundamental threat to the state. Even Nelson, who took a far more modern view of his men, backed the admiral on this occasion . . ‘
Admirals: The naval commanders who made Britain great: Andrew Lambert; Faber 2008, p 193.