10/15/2026
𝐀𝐧𝐝𝐫𝐳𝐞𝐣 𝐓𝐚𝐝𝐞𝐮𝐬𝐳 𝐁𝐨𝐧𝐚𝐰𝐞𝐧𝐭𝐮𝐫𝐚 𝐊𝐨𝐬́𝐜𝐢𝐮𝐬𝐳𝐤𝐨 (𝐅𝐞𝐛𝐫𝐮𝐚𝐫𝐲 𝟒𝐭𝐡 𝟏𝟕𝟒𝟔 - 𝐎𝐜𝐭𝐨𝐛𝐞𝐫 𝟏𝟓𝐭𝐡, 𝟏𝟖𝟏𝟕, 𝐰𝐚𝐬 𝐚 𝐏𝐨𝐥𝐢𝐬𝐡 𝐦𝐢𝐥𝐢𝐭𝐚𝐫𝐲 𝐞𝐧𝐠𝐢𝐧𝐞𝐞𝐫, 𝐬𝐭𝐚𝐭𝐞𝐬𝐦𝐚𝐧, 𝐚𝐧𝐝 𝐦𝐢𝐥𝐢𝐭𝐚𝐫𝐲 𝐥𝐞𝐚𝐝𝐞𝐫 𝐰𝐡𝐨 𝐛𝐞𝐜𝐚𝐦𝐞 𝐚 𝐧𝐚𝐭𝐢𝐨𝐧𝐚𝐥 𝐡𝐞𝐫𝐨 𝐢𝐧 𝐏𝐨𝐥𝐚𝐧𝐝, 𝐭𝐡𝐞 𝐔𝐧𝐢𝐭𝐞𝐝 𝐒𝐭𝐚𝐭𝐞𝐬, 𝐋𝐢𝐭𝐡𝐮𝐚𝐧𝐢𝐚, 𝐚𝐧𝐝 𝐁𝐞𝐥𝐚𝐫𝐮𝐬.
On learning of the American Revolution, Kościuszko, a man of revolutionary aspirations, sympathetic to the American cause and an advocate of human rights, sailed for the Americas in June 1776 along with other foreign officers, likely with the help of a French supporter of the American revolutionaries, Pierre Beaumarchais. After finally arriving in Philadelphia (after a Caribbean shipwreck) he sought out Benjamin Franklin at his print shop; offering to take engineering subject exams (in lieu of any letters of recommendation), he received a high mark on a geometry exam and Franklin's recommendation. On 30 August 1776, Kościuszko submitted an application to the Second Continental Congress at the Pennsylvania State House, and was assigned to the Continental Army the next day.
Kościuszko was born in February 1746, in a manor house on the Mereczowszczyzna estate in Brest Litovsk Voivodeship, then Grand Duchy of Lithuania, a part of the Polish–Lithuanian Commonwealth, now the Ivatsevichy District of Belarus. At age 20, he graduated from the Corps of Cadets in Warsaw, Poland. After the start of the War of the Bar Confederation in 1768, Kościuszko moved to France in 1769 to study. He returned to the Commonwealth in 1774, two years after the First Partition, and was a tutor in Józef Sylwester Sosnowski's household. In 1776, Kościuszko moved to North America, where he took part in the American Revolutionary War as a colonel in the Continental Army. An accomplished military architect, he designed and oversaw the construction of state-of-the-art fortifications, including those at West Point, New York. In 1783, in recognition of his services, the Continental Congress promoted him to brigadier general.
Having not been paid in his seven years of service, in late May 1783, Kościuszko decided to collect the salary owed to him. That year, he was asked by Congress to supervise the fireworks during the 4 July celebrations at Princeton, New Jersey. On 13 October 1783, Congress promoted him to brigadier general, but he still had not received his back pay. Many other officers and soldiers were in the same situation. While waiting for his pay, unable to finance a voyage back to Europe, Kościuszko, like several others, lived on money borrowed from the Polish–Jewish banker Haym Solomon. Eventually, he received a certificate for 12,280 dollars, at 6%, to be paid on 1 January 1784 (equivalent to ~$323,000, paid as installments ~$19,400 a month in 2022), and the right to 500 acres (202.34 ha; 0.78 sq mi) of land, but only if he chose to settle in the United States.
For the winter of 1783–84, his former commanding officer, General Greene, invited Kościuszko to stay at his mansion. He was inducted into the Society of the Cincinnati and into the American Philosophical Society in 1785. During the Revolution, Kościuszko carried an old Spanish sword at his side, which was inscribed with the words Do not draw me without reason; do not sheathe me without honour.
Meanwhile, Kościuszko became more closely involved with political reformers such as Hugo Kołłątaj, Julian Ursyn Niemcewicz and others. Kościuszko argued that the peasants and Jews should receive full citizenship status, as this would motivate them to help defend Poland in the event of war. The political reformers centered in the Patriotic Party scored a significant victory with adopting the Constitution of 3 May 1791. Kościuszko saw the Constitution as a step in the right direction, but was disappointed that it retained the monarchy and did little to improve the situation of the most underprivileged, the peasants and the Jews. The Commonwealth's neighbors saw the Constitution's reforms as a threat to their influence over Polish internal affairs. A year after the Constitution's adoption, on 14 May 1792, reactionary magnates formed the Targowica Confederation, which asked Russia's Tsaritsa Catherine II for help in overthrowing the Constitution. Four days later, on 18 May 1792, a 100,000-man Russian army crossed the Polish border, headed for Warsaw, beginning the Polish–Russian War of 1792.
After the battles, King Stanisław August Poniatowski promoted Kościuszko to lieutenant-general and also offered him the Order of the White Eagle, but Kościuszko, a convinced republican would not accept a royal honor. News of Kościuszko's victory spread over Europe, and on 26 August he received the honorary citizenship of France from the Legislative Assembly of revolutionary France. While Kościuszko considered the war's outcome to still be unsettled, the King requested a ceasefire. On 24 July 1792, before Kościuszko had received his promotion to lieutenant-general, the King shocked the army by announcing his accession to the Targowica Confederation and ordering the Polish–Lithuanian troops to cease hostilities against the Russians. Kościuszko considered abducting the King as the Bar Confederates had done two decades earlier, in 1771, but was dissuaded by Prince Józef Poniatowski. On 30 August, Kościuszko resigned from his army position and briefly returned to Warsaw, where he received his promotion and pay, but refused the King's request to remain in the Army. Around that time, he also fell ill with jaundice.
The King's capitulation was a hard blow for Kościuszko, who had not lost a single battle in the campaign. By mid-September 1792, he was resigned to leaving the country, and in early October, he departed from Warsaw. First, he went east, to the Czartoryski family manor at Sieniawa, which gathered various malcontents. In mid-November, he spent two weeks in Lwów, where he was welcomed by the populace.
On 2 April 1817, Kościuszko emancipated the peasants in his remaining lands in Poland, but Tsar Alexander disallowed this. Suffering from poor health and old wounds, Kościuszko died in Solothurn at age 71 after falling from a horse, developing a fever, and suffering what resembled a stroke a few days later on 15 October 1817. However, DNA studies of Kościuszko's embalmed heart conducted in 2021 and 2022 suggested that endocarditis caused by a Cutibacterium acnes infection was a contributing factor to his death.
Before Kościuszko left for France, he collected his back pay, wrote a will, and entrusted it to Jefferson as executor. Kościuszko and Jefferson had become close friends by 1797 and thereafter corresponded for twenty years in a spirit of mutual admiration. Jefferson wrote that "He is as pure a son of liberty as I have ever known." In the will, Kościuszko left his American estate to be sold to buy the freedom of black slaves, including Jefferson's own, and to educate them for independent life and work.
Several years after Kościuszko's death, Jefferson, aged 77, pleaded an inability to act as executor due to age and the numerous legal complexities of the bequest. It was tied up in the courts until 1856. Jefferson recommended his friend John Hartwell Cocke, who also opposed slavery, as executor, but Cocke likewise declined to execute the bequest.
The case of Kościuszko's American estate reached the U.S. Supreme Court three times. Kościuszko had made four wills, three of which postdated the American one.
None of the money that Kościuszko had earmarked for the manumission and education of African Americans in the United States was ever used for that purpose. Though the American will was never carried out as defined, its legacy was used to found an educational institute at Newark, New Jersey, in 1826, for African Americans in the United States. It was named for Kościuszko.
Primary source: Wikipedia https://en.wikipedia.org/wiki/Tadeusz_Ko%C5%9Bciuszko
Image courtesy of Britannica https://www.britannica.com/biography/Tadeusz-Kosciuszko