Thomas Cresap (January 10, 1702 – June 21, 1790) was an Irish‑born American frontiersman, settler, and colonial militia officer who played a prominent role in early western Maryland and the frontier conflicts of the mid‑18th century, most notably the so‑called “Cresap’s War” (also referred to as the “Maryland–Pennsylvania Border Dispute”).
Early life
Thomas Cresap was born in County Cavan, Ireland, to Samuel Cresap and his wife, whose names are not well documented. The family emigrated to the Province of Maryland in the early 1720s, arriving in the Baltimore area. Cresap married twice; his first wife, Hannah Tomlinson, died in 1742, and he subsequently married Jane “Jean” Barnes. He fathered several children, among them Michael Cresap, who later became a noted militia officer during the American Revolutionary period.
Settlement and frontier activity
In the 1730s Cresap obtained a land grant in the western part of the Province of Maryland, near present‑day Cumberland, where he established a homestead, a ferry, and a trading post along the Potomac River. He engaged in the fur trade, hunting, and the illegal trade of whiskey and other contraband, activities that contributed to tensions with neighboring settlers and colonial authorities.
Cresap’s War (1730s–1742)
Cresap became a leading figure in the boundary dispute between the colonies of Maryland and Pennsylvania, which centered on the location of the “Cresap’s War” (also called the “Conestoga War” in some sources). Acting as an agent for Maryland’s claim, he and his followers forcibly evicted Pennsylvania settlers from the contested region, leading to violent clashes. In 1738, Cresap was arrested by Pennsylvania authorities and sentenced to a short imprisonment; he was later released after diplomatic negotiations between the two colonies.
Military service
During the French and Indian War (1754–1763), Cresap served as a captain in the Maryland militia, participating in frontier defense and expeditions against French and Native American forces. He was credited with organizing local defenses and supplying militia units with provisions from his holdings.
Later life and death
Following the war, Cresap retired to his farm near Frederick, Maryland, where he lived a relatively quiet life. He died on June 21, 1790, at the age of 88, and was interred in the family burial plot near his residence.
Legacy
Thomas Cresap is remembered primarily for his role in early colonial frontier expansion and the Maryland–Pennsylvania border conflict. Several geographical features and historic sites in western Maryland bear his name, including Cresap’s Ferry and the Thomas Cresap Farm, which are listed on the National Register of Historic Places. His descendants, notably Michael Cresap, continued to be involved in military and political affairs during the Revolutionary era.