On July 21, 1804, the Lewis and Clark Expedition passed by the riverbanks that would later become the city of Omaha. On July 22 the Corps of Discovery established a camp near present-day Bellevue for five nights, naming it "Camp White Catfish." On the 27th, William Clark and Reuben Fields investigated mysterious earthen mounds close to where 8th and Douglas Streets and the Heartland of America Park are today in Downtown Omaha. That night they camped in an area that is Eppley Airfield today. The expedition stopped at a point about 20 miles (30  km) north of present-day Omaha, at which point they first met with the Otoe. They had a council meeting with members of the tribal leadership on the west side of the Missouri River. The first recorded instance of a black person in the Omaha area was "York", an enslaved African American who accompanied William Clark on the Expedition.