Raising troops in Tennessee on his own authority, he marched rapidly to the scene of trouble, crossed the border into Florida, and in a few weeks crushed the Seminoles. Of fighting, in fact, there was very little; what there was fell almost entirely to the friendly Indians, and not a single American soldier was killed. But Jackson's actions in the campaign brought on the bitterest controversies of his career. By his order four men were put to death, and he captured Pensacola again, claiming that some Indians had taken refuge there. Two of the four men were Creek Red Sticks. The other two were white men and British subjects. One was Alexander Arbuthnot, an old man of seventy, a trader among the Indians, and, so far as is known, a man of good character. He was taken prisoner, however, and it is supposed a letter he wrote to his son, telling him to take their merchandise to a place of safety, warned some Indians of Jackson's approach. The other British subject was an Englishman named Robert Ambrister, who had been a lieutenant in the British army. He was nephew to the governor of New Providence, one of the British West Indies, and seems to have been in Florida rather in search of adventure than for any clearly ascertainable purpose. A court-martial found Arbuthnot guilty of inciting the Creek Indians to rise against the United States, and of aiding the enemy. Ambrister was found guilty of levying war against the United States. He was first sentenced to be shot; then, on reconsideration, the court changed the sentence to fifty stripes and hard labor for a year. Jackson firmly believed that both were British emissaries, sent to Florida to stir up the Indians. He disapproved the change of Ambrister's sentence, and ordered him to be shot and Arbuthnot to be hanged.