Jeanne Mance, in a memoir to be found among the archives of the seminary at Quebec, tells how the governor now obliged all the colonists to leave their newly constructed houses and retire with their families to the safety of the fort. She herself was forced to leave the hospital. Maisonneuve turned this into a military outpost to guard the isolated redoubts scattered here and there in the field and to protect the workmen, by placing in it a squad of soldiers. He had two pieces of cannon taken there and swivel guns for the windows of the granaries, and he had loopholes cut into the walls of the building all around, even in the chapel which served as an artillery armoury.

In this way the hospital became a fortress for four years and a half. On July 26th the wisdom of Maisonneuve's arrangement was evident. Marguerite Bourgeoys is responsible for the story. On this day 200 Iroquois had concealed themselves in a trench originally built as a defence for the hospital, and which, descending from a height nearby, close to the place where St. Jean Baptiste street is today, crossed the site of St. Paul street.

All of a sudden the concealed foes disclosed their presence by attempting to take possession of the building and to set it on fire. Meanwhile the garrison within, consisting of Lambert Closse, [67] the town major, and sixteen of his men made a vigorous and valorous defence against the 200 from 6 o'clock in the morning to 6 at night, and losing only one man, Denis Archambault, who met his death by a splinter from the cast iron cannon which had exploded, killing him on the spot, but without dealing death to the enemy outside. The cannon was fired by himself. Finally the enemy were forced to retreat, burning a neighbouring house in revenge for their loss of men.

Other engagements of a like nature took place but the details have not been recorded. Three Rivers and Quebec were in similar straits. Disaster, loss, and want of reinforcement for two years had reduced Montreal to but about fifty defenders, so that there was now open talk of abandoning it and leaving Canada.

One hope remained, suggested to the governor by Jeanne Mance; it was that the 22,000 livres put aside as the revenue for the hospital might be diverted to the expense of sending out a reinforcement to save Montreal, and she thought that she might interpret her "unknown benefactress'" goodwill as agreeable to this, seeing the extremity in which Montreal now stood.

But de Maisonneuve accepted the offer only on the condition that in exchange Mademoiselle Mance should receive for the hospital 100 arpents of the domain of the seigneurs. Meanwhile he could go to France and call on the unknown benefactress herself whose name was now divulged to him. Mademoiselle Mance tells how "M. de Maisonneuve determined on departing for France, told me that if he could not obtain at least 100 men, he would return no more to Ville Marie; and in this case he would order me to return to France with all our party." Thus the abandonment of the settlement was now threatened.

Before leaving M. de Maisonneuve named the nephew of Louis d'Ailleboust, M. Charles d'Ailleboust, Sieur des Musseaux, to be the governor of Montreal in his stead.

In the meantime the new governor general, M. de Lauson, of whom we have spoken already, had arrived on October 13th to succeed M. Louis d'Ailleboust at Quebec. This was no good tidings for Montreal, for as Dollier de Casson remarks, the new governor made known "his good feelings towards the Messieurs de Montréal" and the good treatment they ought to hope from him by retrenching 1,000 from the 4,000 livres granted by the general Company for the upkeep of the governor and his garrison. [68]

"I do not wish," says he, "to say anything touching the conduct of this gentleman towards this island, more especially as I wish to believe that he has always had the very best of intentions, although he was always wise to his own interest since if he had more frequently strengthened the embankment here, the Iroquois inundations would not have so easily taken their course towards Quebec and they would not have done the mischief they did, for they have not always respected even his own family."