The 1795 dismemberment of Poland by the Third Partiton. Solid line: Poland's borders prior to the Partition

In a gesture of defiance, a general Polish revolt broke out in 1794 under the leadership of Tadeusz Kosciuszko, a military officer who had rendered notable service in the American Revolution. Kosciuszko's ragtag insurgent armies won some initial successes, but they eventually fell before the superior forces of Russian General Alexander Suvorov. In the wake of the insurrection of 1794, Russia, Prussia, and Austria carried out the third and final partition of Poland-Lithuania in 1795, erasing the Commonwealth of Two Nations from the map and pledging never to let it return.

Source: info-poland.buffalo.edu/classroom/longhist3.html