Note 19 — Chapter IV · ANCIENT INDIAN MOUNDS AND EARTHWORKS IN OHIO. Earthworks of the Mound Builders and their geographical position.—Miamisburgh Mound.—Grave Creek Mound.—Ages and contents of burial mounds.—Rectangular, circular and octagonal Inclosures near Newark.— Marietta Earthworks.—Discoveries made in a burial mound.—Fortifications near Portsmouth.—Encampments in the valley of the Scioto.
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Fort Du Quesne was built about the year 1752. It was situated near the spot where is now the town of Pittsburgh. In 1731 the Indians who then occupied the lands near Marietta formed an alliance with the French, and obtained their assistance in protecting them from the attacks of hostile tribes. These were probably the Iroquois, who at that period had made a treaty with the English, and were their allies during the wars against the French in Canada and this part of North America.