The Battle of Cowpens was an engagement during the American Revolutionary War fought on January 17, 1781 near the town of Cowpens, South Carolina, between U.S. forces under Brigadier General Daniel Morgan and British forces under Lieutenant Colonel Banastre Tarleton, as part of the campaign in the Carolinas (North and South). The battle was a turning point in the American reconquest of South Carolina from the British.

Morgan's forces conducted a double envelopment of Tarleton's forces, the only double envelopment of the war. Tarleton's force of 1000 British troops were set against 2000 troops under Morgan. Morgan's forces suffered casualties of only 25 killed and 124 wounded. Tarleton's force was almost completely eliminated with almost 30% casualties and 55% of his force captured or missing, with Tarleton himself and only about 200 British troops escaping.

A small force of the Continental Army under the command of Morgan had marched to the west of the Catawba River, in order to forage for supplies and raise the morale of local colonial sympathizers. The British had received incorrect reports that Morgan's army was planning to attack the important strategic fort of Ninety Six, held by American Loyalists to the British Crown and located in the west of the Carolinas. The British considered Morgan's army a threat to their left flank. General Charles Cornwallis dispatched cavalry (dragoons) commander Tarleton to defeat Morgan's command. Upon learning Morgan's army was not at Ninety Six, Tarleton, bolstered by British reinforcements, set off in hot pursuit of the American detachment.

Morgan resolved to make a stand near the Broad River. He selected a position on two low hills in open woodland, with the expectation that the aggressive Tarleton would make a headlong assault without pausing to devise a more intricate plan. He deployed his army in three main lines. Tarleton's army, after exhaustive marching, reached the field malnourished and heavily fatigued. Tarleton attacked immediately; however, the American defense-in-depth absorbed the impact of the British attack. The British lines lost their cohesion as they hurried after the retreating Americans. When Morgan's army went on the offensive, it wholly overwhelmed Tarleton's force.

Tarleton's brigade was wiped out as an effective fighting force, and, coupled with the British defeat at the Battle of Kings Mountain in the northwest corner of South Carolina, this action compelled Cornwallis to pursue the main southern American army into North Carolina, leading to the Battle of Guilford Court House, and Cornwallis's eventual defeat at the siege of Yorktown in Virginia in October 1781.

In the opinion of John Marshall, "Seldom has a battle, in which greater numbers were not engaged, been so important in its consequences as that of Cowpens."

The American Revolutionary War (April 19, 1775 – September 3, 1783), also known as the Revolutionary War or American War of Independence, secured a United States of America independent from Great Britain. Fighting began on April 19, 1775, followed by the Declaration of Independence on July 4, 1776. The American Patriots were supported by France and Spain, conflict taking place in North America, the Caribbean, and Atlantic Ocean. It ended on September 3, 1783 when Britain accepted American independence in the Treaty of Paris, while the Treaties of Versailles resolved separate conflicts with France and Spain.Established by Royal charter in the 17th and 18th centuries, the American colonies were largely autonomous in domestic affairs and commercially prosperous, trading with Britain and its Caribbean colonies, as well as other European powers via their Caribbean entrepôts. After British victory in the Seven Years' War in 1763, tensions arose over trade, colonial policy in the Northwest Territory and taxation measures, including the Stamp Act and Townshend Acts. Colonial opposition led to the 1770 Boston Massacre and 1773 Boston Tea Party, with Parliament responding by imposing the so-called Intolerable Acts.

On September 5, 1774, the First Continental Congress drafted a Petition to the King and organized a boycott of British goods. Despite attempts to achieve a peaceful solution, fighting began with the Battle of Lexington on April 19, 1775 and in June Congress authorized George Washington to create a Continental Army. Although the "coercion policy" advocated by the North ministry was opposed by a faction within Parliament, both sides increasingly viewed conflict as inevitable. The Olive Branch Petition sent by Congress to George III in July 1775 was rejected and in August Parliament declared the colonies to be in a state of rebellion.

Following the loss of Boston in March 1776, Sir William Howe, the new British commander-in-chief, launched the New York and New Jersey campaign. He captured New York City in November, before Washington won small but significant victories at Trenton and Princeton, which restored Patriot confidence. In summer 1777, Howe succeeded in taking Philadelphia, but in October a separate force under John Burgoyne was forced to surrender at Saratoga. This victory was crucial in convincing powers like France and Spain an independent United States was a viable entity.

France provided the US informal economic and military support from the beginning of the rebellion, and after Saratoga the two countries signed a commercial agreement and a Treaty of Alliance in February 1778. In return for a guarantee of independence, Congress joined France in its global war with Britain and agreed to defend the French West Indies. Spain also allied with France against Britain in the Treaty of Aranjuez (1779), though it did not formally ally with the Americans. Nevertheless, access to ports in Spanish Louisiana allowed the Patriots to import arms and supplies, while the Spanish Gulf Coast campaign deprived the Royal Navy of key bases in the south.

This undermined the 1778 strategy devised by Howe's replacement, Sir Henry Clinton, which took the war into the Southern United States. Despite some initial success, by September 1781 Cornwallis was besieged by a Franco-American force in Yorktown. After an attempt to resupply the garrison failed, Cornwallis surrendered in October, and although the British wars with France and Spain continued for another two years, this ended fighting in North America. In April 1782, the North ministry was replaced by a new British government which accepted American independence and began negotiating the Treaty of Paris, ratified on September 3, 1783.