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The granting of the vast area of land on the Ohio River by the King of England to the Ohio Land Company in 1749 brought home to the French the realization that the West was disputed territory, and Governor Galissonière immediately dispatched Céloron de Bienville with a band of two hundred and seventy men to reënforce the French claim to the Ohio Valley. It is an ancient French custom to bury leaden plates at the mouths of rivers as a sign of possession, and Céloron bore a supply of such memorials to bury at the mouths of rivers emptying into the Ohio. Ascending the St. Lawrence the party crossed Lake Ontario to the Niagara River. This strategic portage path around Niagara Falls, which joined Lake Ontario and Lake Erie, used from time immemorial, became important to the French when they secured the mastery of Lake Ontario after the erection of Fort Frontenac. Four years after the English came to Oswego the French erected the first permanent Fort Niagara here in 1726, absolutely controlling all intercourse with the West by way of the Great Lakes. It was the key of the lake