Arrival in Georgia

Lachlan McIntosh was born near Raits, Badenoch, Scotland. McIntosh's father, John Mòr McIntosh, moved the family to Georgia in 1736 with a group of 100 Scottish settlers; they founded the town of New Inverness (which was later renamed Darien) at the mouth of the Altamaha River. John McIntosh led the colonists as they carved out the new settlement from dense forest. The dangers of frontier life were brought home to Lachlan in 1737 when his younger brother Lewis McIntosh was killed by an alligator while swimming in the river.^[1]

Georgia was then governed by James Oglethorpe, who had founded the colony in 1732. It was a highly militarized colony, as clashes with neighboring Spanish Florida and its fortress city of St. Augustine to the south were common. In one of these clashes in 1740, during the War of Jenkins' Ear, Lachlan's father was captured by the Spanish and held prisoner for two years. The elder McIntosh was eventually released, but his health had deteriorated during his captivity, and he died a few years later. Before his death he had supported the Georgia Trustees in their opposition to the introduction of slavery into Georgia, which was demanded by an increasing number of colonists in need of labor. This earned him the gratitude of Oglethorpe.^[1] The "Mòr" of his title is Scots Gaelic for "big".^[2]

After his father's death, McIntosh was sent to the Bethesda Orphanage in Savannah under the care of the noted evangelist George Whitefield. His elder brother, Colonel William McIntosh, served under Oglethorpe and helped to repulse a Spanish invasion of the colony.^[3] Lachlan spent two years at the orphanage before traveling to Fort Frederica to serve as a military cadet. During this time, the Jacobite Rebellion broke out in Scotland. Lachlan and his brother William planned to travel to Scotland and join the rebellion, but General James Oglethorpe, who had become a friend and mentor to the young McIntosh, convinced them to remain in Georgia.

Lachlan's brother William has sometimes been confused with William McIntosh of the Creek Nation, who was their cousin. The Creek William McIntosh was the son of Capt. William McIntosh, a Tory in the Revolutionary War, and a high-status Creek woman. The senior William McIntosh was the son of Capt. John McIntosh, who had immigrated with his brother Roderick, and with John "Mòr" McIntosh from Scotland.^[4] Confusion about the names stems from the fact that on their ship The Prince of Wales, at least five males were named John McIntosh in one form or another.^[5]

In 1748, McIntosh moved to Charleston, South Carolina, where he took a position as a clerk for Henry Laurens, a wealthy merchant and slave trader. Laurens became a lifelong friend and mentor. In 1756, McIntosh married Sarah Threadcraft. He soon returned with her to Georgia, where he studied surveying. He acquired land in the Altamaha River delta and slaves to work it; he became a prosperous rice planter.

Early war

By 1770, McIntosh had become a leader in the independence movement in Georgia. In January 1775 he helped organize delegates to the Provincial Congress from the Darien District of St. Andrew Parish. On January 7, 1776, McIntosh was commissioned as a colonel in the Georgia Militia. He raised the 1st Georgia Regiment of the Georgia Line,^[6] organized the defense of Savannah, and helped repel a British assault at the Battle of the Rice Boats in the Savannah River. He was promoted to the rank of brigadier general in the Continental Army, charged with defense of Georgia's southern flank from British incursions from Florida, by then a British possession. On October 22, 1776, McIntosh ordered his brother William to construct a fort on the Satilla River to protect Georgia from Florida. The fort was the first to be named Fort McIntosh.

Duel with Button Gwinnett

During the period of 1776 to 1777, McIntosh became embroiled in a bitter political dispute with Button Gwinnett, the Speaker of the Georgia Provisional Congress and a radical Whig leader. Their bitter personal rivalry began when McIntosh succeeded Gwinnett as commander of Georgia's Continental Battalion in early 1776. The two men represented opposing factions in a deeply divided Patriot movement in Georgia. Gwinnett had been forced to step aside after his election had been called into question by opposing forces within the independence movement. Gwinnett, thwarted in his military ambitions, became a delegate to the Continental Congress and a signer of the United States Declaration of Independence. He returned to Georgia after his allies gained control of the Provisional Congress and succeeded in electing him speaker. Shortly afterward, he was elected president and commander-in-chief of the Committee of Safety.

Gwinnett began purging the government and the military of his political rivals. One of his early targets was George McIntosh, Lachlan's brother, who had opposed Gwinnett's election. Gwinnett had George arrested and charged with treason against the revolution. In addition, Gwinnett had ordered Lachlan McIntosh to lead a poorly planned military expedition into British Florida. The operation was a disaster; and Gwinnett and McIntosh publicly blamed each other for the failure, straining the already tenuous relationship between the two men.

On May 1, 1777, Lachlan McIntosh, a staunch supporter of John Treutlen for Governor, addressed the Georgia assembly and denounced Gwinnett in the harshest terms, calling Gwinnett a "scoundrel and lying rascal." Gwinnett sent a written challenge to McIntosh demanding an apology or satisfaction. McIntosh refused to apologize, and Gwinnett challenged him to a duel.

On May 16, in a field owned by James Wright a few miles east of Savannah, Gwinnett and McIntosh met to duel with pistols. At a distance of 12 paces, the two men leveled and fired virtually simultaneously. Gwinnett received a ball to the thigh and McIntosh was struck in the leg. McIntosh would recover from his wounds, but Gwinnett's wound was mortal and he died three days later.^[7] Gwinnett's allies had McIntosh charged with murder, but he was acquitted in the ensuing trial. George Washington, fearing Gwinnett's allies would take revenge on McIntosh, ordered him to report to Continental Army headquarters on October 10. He spent the winter of 1777–1778 with the Continental Army at Valley Forge, Pennsylvania, where he commanded several regiments of North Carolina troops.

Military service on the western frontier and in the South

On May 26, 1778, McIntosh was given command of the Western Department of the Continental Army, headquartered at Fort Pitt (present-day Pittsburgh, Pennsylvania) on the Pennsylvania frontier. He restored order along the frontier and conceived a plan to attack the British stronghold of Fort Detroit. He established several new forts including Fort Laurens, named for his friend and mentor Henry Laurens, who had become President of the Continental Congress, and Fort McIntosh (near present-day Beaver, Pennsylvania) to prepare for the attack. The expedition against Fort Detroit was doomed however, and the troops were forced to turn back before reaching the fort.

McIntosh was replaced as commander of the Western Department by Colonel Daniel Brodhead on March 5, 1779. Washington ordered McIntosh to return to the south to join General Benjamin Lincoln in Charleston, South Carolina. He marched to Augusta, Georgia, in command of the Georgia troops, and then proceeded to Savannah, where he commanded the 1st and 5th South Carolina regiments during the siege of Savannah.

After the battle, he retired his troops to Charleston, where he remained to defend the city from the British Army. On May 12, 1780, General Lincoln was forced to surrender the city to British General Sir Henry Clinton. McIntosh was taken prisoner and remained in captivity until he was exchanged on February 9, 1782, for Charles O'Hara. The war was brought to an end in 1783 with the Peace of Paris which recognized American independence and transferred East and West Florida to Spain.