The last Chesapeake Indian group Smith found on the upper Potomac river was the Nacotchtanke. Their settlement was just below Washington, D. C., probably on what is now Bolling Air Force Base. Aligned with the Piscataway Paramount Chiefdom, Smith found the Nacotchtanke to be friendly. He and his crew probably spent a night at the settlement. From it, they continued up the Potomac to the first rapids or Little Falls, which prevented them from rowing further. They carefully examined the rocks around the falls, seeking gold and other valuable minerals. On the highest clifts in this area, they dug holes and found “…a clay sand so mingled with yellow spangles as if it had been half pindust” [brass filings].