Henry Mowat was born about 1734 in Scotland. Little is securely documented about his parents, exact birthplace, and childhood education, but he entered the Royal Navy as a young man and built a professional career through long service. For a Scot without a great estate, the navy offered training, income, patronage, and advancement within Britain’s expanding empire. Naval education occurred largely aboard ship. Mowat learned seamanship, navigation, gunnery, signaling, discipline, maintenance, provisioning, and the management of crews. Junior officers also studied charts and mathematics and depended upon senior patrons for promotion. Service exposed him to disease, storms, shipboard hierarchy, and the practical demands of distant stations. By the years before the American Revolution, Mowat had accumulated substantial experience in North American waters. He surveyed coasts, protected trade, enforced imperial regulations, and developed familiarity with New England harbors. Such duties placed naval officers directly within disputes over customs, smuggling, and colonial resistance. Mowat’s surviving reputation centers on the burning of Falmouth, now Portland, Maine, in 1775. That action occurred after decades of professional formation rather than as an isolated expression of cruelty. He viewed coastal towns through the strategic assumptions of a royal officer responsible for suppressing rebellion and protecting naval authority. Before becoming notorious in New England memory, Mowat had been shaped by Scottish origins, shipboard apprenticeship, technical study, patronage, repeated Atlantic service, and strict obedience to orders. The gaps in his private biography should remain visible. His early life is best understood through the institutional culture of the eighteenth-century Royal Navy, which trained officers to place duty, hierarchy, and imperial strategy above local civilian relationships.