The Battle of Stillman's Run, also known as the Battle of Sycamore Creek or the Battle of Old Man's Creek, occurred in Illinois on May 14, 1832. The battle was named for the panicked retreat by Major Isaiah Stillman and his detachment of 275 Illinois militia after being attacked by many fewer Sauk warriors of Black Hawk's British Band. The engagement was the first battle of the Black Hawk War (1832), which developed after Black Hawk crossed the Mississippi River from Iowa into Illinois with his band of Sauk and Fox warriors to try to reclaim territory. The militia had pursued a small group of Sauk scouts to the main British Band camp following a failed attempt by Black Hawk's emissaries to negotiate a truce.