About the year 1821, Captain Denison formed the design to purchase the farm west of the city, now known as the Rusholme property. The owner lived at Niagara. A friend who knew of his intention, told him one summer's morning, while he was looking at some goods in a store, that he would not get the land, as another man had left that morning for Niagara, in Oates's sloop, to gain the start of him. The day being unusually fine, Mr. Denison noticed that the sloop was still in sight, becalmed a mile or two off Gibraltar Point. Home he went, put up some money for the purchase, mounted his horse and set out for Niagara round the head of the lake, travelling all day and through the night, and arriving shortly after daybreak. There he saw the sloop in the river, endeavouring with the morning breeze to make the landing. To rouse up the intending vendor, to close the bargain, and get a receipt for the money, was soon accomplished; and when the gentleman who had hoped to forestall him came on the scene, he was wofully chopfallen to find himself distanced in the race. From the close of the war until the year 1837, Mr. Denison was occupied, like other men of his position, with his duties as a magistrate, the cultivation of his farm, and the rearing of his family. In 1822, he organized the cavalry corps now known as the Governor-General's Body-Guard. When the rebellion broke out, he took up arms again in defence of the Crown, and on the day of the march up Yonge Street, was entrusted with the command of the Old Fort. At about noon a body of men was seen approaching. Eagerly and anxiously the defenders waited, expecting every moment an onset, and determined to meet it like men. The suspense lasted some minutes, when suddenly the Major exclaimed, "Why surely that's my brother Tom!" And so it was. The party consisted of a number of good loyalists, headed by Thomas Denison, of Weston, hastening to the aid of the Government against Mackenzie and his adherents. Of course, the gates were soon thrown open, and, with hearty cheers on both sides, the new-comers entered the Fort. For six months Major Denison continued in active service with his cavalry, and in the summer of 1838, was promoted to command the battalion of West York Militia. His eldest son, the late Richard L. Denison, succeeded to the command of the cavalry corps, which was kept on service for six months in the winter of 1838-9. Mr. Denison was elected an alderman of Toronto in the year 1834, and served in the same capacity up to the end of 1843. That he was quite independent of the "Family Compact," or of any other official clique, is shown by the fact, that on Mackenzie's second expulsion from the House of Assembly in 1832, Alderman Denison voted for his re-election for the County of York.