Commodore John Rodgers was Commander of the U.S. Navy Squadron at Valparaiso in 1866.
Rodger was made Commodore in 1864 and Commandant of the Boston Navy Yard in 1866, a post he held until 1869. In September 1865 he was placed in command of a small fleet, with the Vanderbilt as his flagship. He arrived in Valparaiso early in 1866 and found a Spanish squadron threatening to bombard the city. He sought to intervene militarily but was prevent by the reluctance of the English, French, Prussians and Italians to help. He did what he could peacefully to protect American property (#13460). JW appears to have met him during his trip to Valparaiso in 1866 (#04335). Rodger was made Rear Admiral in 1870.
Johnson, Robert E., Rear Admiral John Rodgers, 1812-1882, Annapolis, 1967; Johnson, R. J., 'Rear Admiral John Rodgers', Dictionary of American Biography, 1935.