Once more he was spared from torture at the intercession of his adopted relations.

He then made an even bolder bid for freedom, and fled to the south, up the valley of the Richelieu and the Hudson, and thus reached the most advanced inland post of Dutch America--then called Orange, now Albany--on the Hudson River.

From this point he was conveyed to Holland, and from Holland he returned to Canada.
Soon after his return he joined two Jesuit fathers who were to visit a mission station of the Jesuits amongst the Onondagas (Iroquois) on a lakelet about thirty miles south-east of the present city of Rochester.

The Iroquois (whose language Radisson had learnt to speak) received them with apparent friendliness, and there they passed the winter.

But in the spring Radisson found out that the Onondaga Iroquois were intending to massacre the whole of the mission.
Instructed by him, the Jesuits pretended to have no suspicions of the coming attack, but all the while they were secretly building canoes at their fort.