...h the invaders and made a long and bold struggle for the prize, and thus it became necessary to build more forts and station a stronger force there. In 1816, a fort was built at Chicago, and one at Prairie du Chien , for the better protection of the fur traders, the miners, and those who tilled the teeming soil, and these forts, in those days, were literally cities of refuge. Of a reconnaissance made in th...