Rhodes did not, however, have direct political power over the independent Boer Republic of the Transvaal. He often disagreed with the Transvaal government's policies, which he considered unsupportive of mine-owners' interests. In 1895, believing he could use his influence to overthrow the Boer government, Rhodes supported the Jameson Raid, an unsuccessful attempt to create an uprising in the Transvaal that had the tacit approval of Secretary of State for the Colonies Joseph Chamberlain. The raid was a catastrophic failure. It forced Cecil Rhodes to resign as Prime Minister of the Cape Colony, sent his oldest brother Col. Frank Rhodes to jail in Transvaal convicted of high treason and nearly sentenced to death, and contributed to the outbreak of the Second Boer War.