Until his twenty-first year he worked with his father on a farm, and then left to seek his fortune in the world, with all his effects carried under his arm, wrapped in a cotton handkerchief. His first entry on independent life was as a deck-hand, before the mast of the schooner Liberty. In that capacity he remained two years, and then, having acquired a good knowledge of seamanship, was made mate, holding that rank two years. In 1839, he rose a step higher, and for two seasons was master of the Commodore Lawrence. Captain Bradley now commenced his career as an owner as well as master of vessels. In 1841, he had built for him, in company with Mr. A. Cobb, then a merchant at Birmingham, Ohio, the schooner South America, of 104 tons. When she was completed he took command of her and sailed her for three seasons. In 1844, in company with Mr. Cobb, he had built the schooner Birmingham, of 135 tons burden, and taking command of her himself, sailed her three years. In 1848, the same parties built the Ellington, of 185 tons, which Capt. Bradley sailed for one year. The following year he shifted his command to the propeller Indiana, 350 tons burden, which he and his associate, Mr. Cobb, had built for the Buffalo and Chicago trade. Capt. Bradley ran her himself three years and then returned to a sailing vessel, having late in the season of 1852, turned off the stocks a smart new schooner, the Oregon, of 190 tons burden, which he ran to the end of her first season, and then bade adieu to sea-faring life. During his many years' life on the lakes, in various craft and under all kinds of circumstances, it is remarkable that he never met with a serious casualty; he was enterprising, active, vigorous in mind and body; a prudent business man and at the same time a thorough sailor. In the spring of 1853, he resumed his work of increasing his lake navy by building the Challenge, of 238 tons, followed by one or more vessels yearly. In 1854 was built the Bay City, 190 tons; in 1855 the C. G. Griswold, 359 tons; in 1856 the schooners Queen City, 368 tons, and Wellington, 300 tons; in 1858 the schooner Exchange, 390 tons. At this point he rested three years and then resumed work.