- ' -WHISTLER’S ANCESTOR(Chicago Tribune)A grandfather of the artist Whistler built Ft. Dearborn ori the south bank of the Chicago river at the point where the -stream enters Lake Mich!gan. Three small cannon defended tip* stockade. At diagonally opposite corner.; it had two blockhouses. Within the Inclosuro stood several log buildings—the barracks, the magazine, the storehouses, and the commandant's headquarters. To bring water in time of siege and as a way out if necessity required, an underground passage led from the parade ground to the river.Captain Nathan Heald, from somewhere In New Hampshire, commanded the post wfcsn the war of 1S12 began. On the Sth of August an Indian runner arrived, bringing a totter in which General Hull directed Heald to evacuate the fort at Chicago, if practicable, and in that event to distribute all the United States property contained in the United States factory. or agency, among the Indian* of the neighborhood and repair to Ft. Wayne.Heald gn*pe«L That it might be wise strategy in abandon Ft. Dearborn, he could understand; British emissaries hat