First Grinnell expedition

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The First Grinnell expedition of 1850 was the first American effort, financed by Henry Grinnell, to determine the fate of the lost Franklin Northwest Passage expedition. Led by Lieutenant Edwin De Haven, the team explored the accessible areas along Franklin's proposed route. In coordination with British expeditions, they identified the remains of Franklin's Beechey Island winter camp, providing the first solid clues to Franklin's activities during the winter of 1845, before becoming icebound themselves.