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https://archive.org/details/saintamongsavage0000talb
Saint among savages; the life of Isaac Jogues by Francis Talbot, S.J.

pg 134-135
...Then came a messenger from one of the villages in which they had been welcomed on their entry into the Petun land. The runner told them that some of the people who were sick were begging them to return.
It was a call from God. They could not but heed it. In order to complete the journey of thirty-five miles by daylight, they started out about three o'clock in the morning. All the country was pale with snow in the dawn, and the mountain air was painfully cold. Jogues was still gripped by the fever and unsteady on his legs. They slid their snowshoes labouriously over the crackling crust of the icy snow. Frequently, they stopped for breath in deadly exhaustion. But they had to shorten their rests, for fear lest they die of the cold. Their only food, a lump of corn-bread about the size of the fist, was hard as ice. They arrived at the village late at night, covered with sweat and yet half-frozen, they said. The sick persons were still alive. They were baptized. "Some souls gone astray here and there, who are placed on the road to heaven when they are about to be swallowed up in hell," was their comment, "deserve a thousand times more than these labors, since these souls have cost the Saviour of the world much more than that."

pg 141
Meanwhile, the Fathers were holding their own councils, counting up the results of their spiritual labors and planning new conquests. During the past winter they had preached before or conversed with ten thousand barbarians. They baptized more than a thousand, almost all of whom were dying with the small-pox. Among these were three hundred and sixty children under seven years of age; in addition, they counted "more than a hundred other little children who were baptized in the preceding years, but who were harvested by this same disease and were gathered by the angels like flowers of Paradise."

pg 146
When the missioners were assembled once more at Sainte Marie in March, they totaled the results of the winter of 1640 and 1641. They had announced the Gospel to sixteen or seventeen thousand barbarians of four distinct peoples, the Hurons, the Algonquins, the Petuns, and the neutrals. They had been able to baptize only about one hundred in sickness.