Gilbert du Motier, Marquis de Lafayette, entered the American Revolutionary War as a young French officer seeking a role in the struggle against Britain. Arriving in 1777, he received a major general's commission in the Continental Army and formed a close relationship with George Washington. Wounded at Brandywine, he subsequently gained practical command experience. His aristocratic status and commitment helped connect the American cause with French public opinion, although state decisions about alliance depended on strategic interests beyond any one volunteer.

Returning to France in 1779, Lafayette pressed for greater support and came back to America in 1780. During the Virginia campaign of 1781 he manoeuvred against Cornwallis, avoiding destruction while helping create conditions for the concentration of American and French forces at Yorktown. He participated in the siege that ended with the British surrender. His contribution lay in command, diplomatic connections and persistence, not sole responsibility for the decisive victory. Continued correspondence and travel maintained his place in transatlantic public life after the war.

In France he advocated reform through the Assembly of Notables and the Estates General. In 1789 he helped frame proposals associated with the Declaration of the Rights of Man and of the Citizen and became commander of the Paris National Guard. He sought a constitutional monarchy, placing him between defenders of royal absolutism and advocates of more radical change. The shooting of petitioners at the Champ de Mars in 1791 damaged his standing. Conflict over the monarchy and war drove him from France in 1792; captured abroad, he spent years in Austrian custody before release in 1797.

Lafayette opposed Napoleon's concentration of power and later returned to political activity under the Bourbon Restoration. His 1824–1825 tour of the United States produced public celebrations and reinforced his image as a surviving link to the Revolution. He supported antislavery ideas, including an experimental project in French Guiana, while the societies celebrating him retained slavery and unequal citizenship. In the July Revolution of 1830 he again commanded the National Guard and supported Louis-Philippe, hoping for a more liberal monarchy, then became dissatisfied with its direction. He died in 1834. His career linked military independence and constitutional reform while exposing tensions between universal rights and social hierarchy.