The success of Fort Toronto persuaded the Governor General of New France, the Marquis de la Jonquière, to order the construction of a larger fort, with more trading capacity and military potential, in an effort to consolidate France's hold of the region and its trade routes.

[5] The new fort was named for Antoine Louis Rouillé, Comte de Jouy and French Minister of Marine and Colonies from 1749 to 1753.

[6] The fort's construction had been ordered to further establish a French presence in the area, and to intercept the trade of indigenous people travelling towards a British fur-trading post in present-day Oswego.

According to a report of the Abbé Picquet, the indigenous people received a larger amount of silver for their beavers at Oswego.

[5] After the fall of Fort Niagara in July 1759, the British under Lieutenant Francis came to Rouillé and found only burnt timbers.

[10] After the destruction of Fort Rouillé, no attempt was made to re-establish a settlement in the vicinity until more than thirty years later, when Governor Simcoe laid down the foundations of York in 1793, four miles east of the French stockade.

"The fort of Toronto was at the end of the bay, on the side which is quite elevated and covered by flat rock so that vessels cannot approach within cannon shot.

A wall surrounded the fort with an entrance to the south-facing Lake Ontario and a small road (chemin).

Captain Gother Mann showed the layout in his map, "Plan of the Proposed Toronto Harbour," dated December 6, 1788.

Established 1749 AD, by the order of the government of Louis XV in accordance with the recommendations of the Count de la Galissonniere, Administrator of New France 1717–1749.

In the summer of 1887, a large obelisk, designed by architects Langley and Burke, was unveiled at the Toronto Industrial Exhibition to mark the spot where the original French-built Fort Rouillé was erected.

Two commemorative plaques – one in English, and one in French – are attached to the base of the obelisk, placed there by the Ontario Heritage Foundation.

It was established by order of the Marquis de La Jonquière, Governor of New France, to help strengthen French control of the Great Lakes and was located here near an important portage to capture the trade of Indians travelling southeast toward the British fur-trading centre at Oswego.

A small frontier post, Fort Rouillé was a palisaded fortification with four bastions and five main buildings.

After the evacuation of other French posts on Lake Ontario, Fort Rouillé was destroyed by its garrison in July 1759.