Band after band of Sioux appeared, with their wolfish dogs and their sturdy and all-enduring squaws burdened with the heavy hide coverings of their teepees, or buffalo-skin tents. They professed friendship and begged for arms. Those of one band had blackened their faces in mourning for a dead chief, and calling on Le Sueur to share their sorrow, they wept over him, and wiped their tears on his hair. Another party of warriors arrived with yet deeper cause of grief, being the remnant of a village half exterminated by their enemies. They, too, wept profusely over the French commander, and then sang a dismal song, with heads muffled in their buffalo-robes.[362] Le Sueur took the needful precautions against his dangerous visitors, but got from them a large supply of beaver-skins in exchange for his goods. When spring opened, he set out in search of mines, and found, not far above the fort, those beds of blue and green earth to which the stream owes its name. Of this his men dug out a large quantity, and selecting what seemed the best, stored it in their vessel as a precious commodity. With this and good store of beaver-skins, Le Sueur now began his return voyage for Louisiana, leaving a Canadian named D'Eraque and twelve men to keep the fort till he should come back to reclaim it, promising to send him a canoe-load of ammunition from the Illinois. But the canoe was wrecked, and D'Eraque, discouraged, abandoned Fort l'Huillier, and followed his commander down the Mississippi.[363] Le Sueur, with no authority from government, had opened relations of trade with the wild Sioux of the Plains, whose westward range stretched to the Black Hills, and perhaps to the Rocky Mountains. He reached the settlements of Louisiana in safety, and sailed for France with four thousand pounds of his worthless blue earth.[364] Repairing at once to Versailles, he begged for help to continue his enterprise. His petition seems to have been granted. After long delay, he sailed again for Louisiana, fell ill on the voyage, and died soon after landing.[365]