Tadeusz Kościuszko developed his military engineering skills through study in Warsaw and Paris before joining the American struggle for independence in 1776. Congress commissioned him as an engineer with the rank of colonel. His work emphasized the relationship between terrain, fieldworks, communications, and the movement of armies rather than personal battlefield command.

In 1777 he helped select and fortify the American position at Bemis Heights, contributing to the Saratoga campaign. He subsequently strengthened the defenses at West Point, where control of the Hudson River was strategically important. Later, as engineer with Nathanael Greene's southern army, he assisted river crossings, defensive works, and siege operations, including the unsuccessful attack on Ninety Six. Congress promoted him to brigadier general at the war's end.

Returning to the Polish-Lithuanian Commonwealth, Kościuszko entered its army and fought against Russian intervention in 1792. In 1794 he led an insurrection against foreign domination and the partitioning powers. Victory at Racławice, involving peasant scythemen, became an important symbol of popular participation. His proclamation at Połaniec promised limited relief from peasant obligations, seeking broader support without fully abolishing serfdom. Defeat at Maciejowice left him wounded and captured, and the uprising collapsed.

Released from Russian imprisonment in 1796, he revisited the United States before returning to Europe. He hoped to secure support for Polish independence but resisted arrangements that subordinated it to Napoleon's ambitions. His 1798 American will directed funds toward purchasing freedom and education for enslaved people. Competing wills and prolonged legal proceedings prevented that plan from being fulfilled. He died in Switzerland in 1817. His engineering and republican service joined efforts to broaden liberty, though peasant reforms and the emancipation bequest fell short of his ideals.