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.

Wikipedia