Jackson was at Mobile, Alabama, not very far distant as the crow flies from Pensacola, and when the intelligence of these happenings had been confirmed immediately set about raising a force of Americans. By November he had 2,000 volunteers and early in that month marched from Fort Montgomery (Montgomery, Alabama) upon Pensacola. November 6 he was two miles from that city. To ascertain the Spaniard’s intentions he sent Major Pierre to wait upon the commandant of the city and was rewarded for his pains by having his envoy fired upon. By midnight Jackson had his men in motion against the city, and in the hot engagement which followed the Spanish and British were badly worsted. The British fled down the Bay in their ships, blowing up Fort San Carlos in their retreat and carrying away one of the higher Spanish officers—certainly, on the whole, a not very grateful return for the benefits bestowed upon them by their hosts.
The Creek and Seminole Indians who had begun to rally to the English standard were much impressed by this display of force on the part of the Americans and esteeming Jackson a very bad medicine, indeed, wisely decided to return to the prosaic paths of peace.
During the Civil War, Fort San Carlos played no conspicuous part. The limelight of fame was thrown on its close neighbor, Fort Pickens, on Santa Rosa Island. This latter post at the outbreak of the war was in charge of Lieutenant Adam J. Slemmer, a Pennsylvanian, who, seeing the conflict impending, concentrated (in Fort Pickens as being the easiest one of them all to defend) the forces in the various forts under his jurisdiction. From January 9 to April 11, 1861, Slemmer was in a state of siege in Fort Pickens and on the latter date was relieved by forces from the North. The point was held by Federal troops throughout the war.
A curious incident which occurred early in 1914 at Fort San Carlos recalled vividly to the officers there the part the little Spanish post played in the days when pirates roamed the Spanish Main and all of this part of the world was new. A stranger came to the fort with an old parchment which he declared showed the location of buried treasure in the old fort. He would not tell how he came by the document, but its evident antiquity aroused interest and for an idle hour’s interest the officers of the post decided to dig for the buried treasure. On the parchment was a well drawn plan of the fort with a cross in a particular corner of the parade. This point was located with some little difficulty and men were set to digging. For a time nothing interesting occurred, but after a while one of the men struck a rotten wooden board which proved to be the top of an old well. At the bottom of this covered-over well was discovered a lot of watery mud which, when it had been dug into, revealed the top of an old chest. Darkness fell now and it was not considered worth while to continue operations until the next day. The next morning when the men went back to work they found that the stirring up of the earth and water had caused the object, whatever it was, to sink so deep into the unstable soil of the spot that it could not be recovered!