In 1748, Pennsylvania sent Conrad Weiser to Logstown, a council and trade village on the Ohio River. Here he held council with chiefs representing 10 tribes, including Lenape and Shawnee, and the Iroquois. He arrived at a treaty of friendship between Pennsylvania and these tribes. Threatened by this development and the continued activity of British traders in the Ohio valley, the French redoubled their diplomatic efforts and began to build a string of forts, culminating in Fort Duquesne at present-day Pittsburgh, in 1754.