La Salle guessed the cause of their fright; and, in order to confirm their delusion, he drew with charcoal, on the trunks of trees from which he had stripped the bark, the usual marks of an Iroquois war-party, with signs for prisoners and for scalps, after the custom of those dreaded warriors. This ingenious artifice, as will soon appear, was near proving the destruction of the whole party. He also set fire to the dry grass of the prairies over which he and his men had just passed, thus destroying the traces of their passage. “We practised this device every night, and it answered very well so long as we were passing over an open country; but, on the thirtieth, we got into great marshes, flooded by the thaws, and were obliged to cross them in mud or water up to the waist; so that our tracks betrayed us to a band of Mascoutins, who were out after Iroquois. They followed us through these marshes during the three days we were crossing them; but we made no fire at night, contenting ourselves with taking off our wet clothes and wrapping ourselves in our blankets on some dry knoll, where we slept till morning. At last, on the night of the second of April, there came a hard frost, and our clothes, which were drenched when we took them off, froze stiff as sticks, so that we could not put them on in the morning without making a fire to thaw them. The fire betrayed us to the Indians, who were encamped across the marsh; and they ran towards us with loud cries, till they were stopped half way by a stream so deep that they could not get over, the ice which had formed in the night not being strong enough to bear them. We went to meet them, within gun shot; and whether our fire-arms frightened them, or whether they thought us more numerous than we were, or whether they really meant us no harm, they called out, in the Illinois language, that they had taken us for Iroquois, but now saw that we were friends and brothers; whereupon, they went off as they came, and we kept on our way till the fourth, when two of my men fell ill and could not walk.” In this emergency, La Salle went in search of some watercourse by which they might reach Lake Erie, and soon came upon a small river, which was probably the Huron. Here, while the sick men rested, their companions made a canoe. There were no birch-trees; and they were forced to use elm bark, which at that early season would not slip freely from the wood until they loosened it with hot water. Their canoe being made, they embarked in it, and for a time floated prosperously down the stream, when at length the way was barred by a matted barricade of trees fallen across the water. The sick men could now walk again, and, pushing eastward through the forest, the party soon reached the banks of the Detroit.