In front the Ottawa flowed, through its picturesque and fertile islands, while on the other side the St. Lawrence rolled like a river of gold. A little to the north-west the water expanded into the Lake of Two Mountains, the twin peaks which gave it their name appearing in the hazy distance. On Ile St. Paul Le Ber had erected large storehouses. On Ile Perrot stood a cluster of buildings constructed by Le Ber’s rival and antagonist, Perrot, the ex-Governor of Ville Marie, in order to intercept the Indian tribes from the upper lakes on their way to the annual fair at Montreal. Ile Perrot was the rendezvous of soldiers who had escaped from the restraints of a harsh discipline to the freedom of the woods, and of rovers of every description outlawed by the royal edict. The fort at Senneville was remarkably well built; the material of rough boulder stones, with stone jambs, lintel sills and fire-places. The buildings formed a parallelogram of which the residence was one end, the sides being simply defensive walls, nowhere more than twelve feet high, pierced with loopholes and having a gateway. At the angles stood flanking towers, the first two being connected with a wall which did not come much above the first floor window. The courtyard was nearly square, measuring about eighty feet each way, and looking north-west across the Lake of Two Mountains. The residential part had a frontage of about eighty feet and a depth of thirty-five. In front it was two stories in height, but, as the ground was higher inside the courtyard, at the back it was only a story and a half. It had a high pitched roof, tall chimneys and wide fire-places. The walls of the towers were strengthened by an outward spread at the base. The towers measured only about twelve feet square inside; they were two and a half stories in height and had large windows in their outer walls, and on the sides, commanding the main walls, small embrasures were mounted with light artillery. In addition to the castle proper there were out-buildings which served more than one purpose. A few hundred yards back from the river the ground swelled to a gently wooded height, crowned by a fortified windmill. These picturesque structures were a distinctive feature in the landscape throughout all New France and did good service in protecting the settlers. The mill at Senneville possessed rather an unusual adjunct, a hooded door which served the same purpose as the machicolations of a mediæval castle. The tower was three stories in height, and measured fifteen feet inside, the floor being supported by strong oak beams. The chimney was simply a flue in the thickness of the wall opening to the outer air just below the second story ceiling; the hood opened before the floor of the same chamber. The roof was of conical form, covered with shingles, the latter always a point of weakness in time of attack.