Dauphin Island has absolutely THE BEST American Revolution stories you've NEVER heard of. One of the many stories that goes unrecognized for its historical importance is Dauphin Island's tenth armed, amphibious invasion, the 1780 Spanish siege of British Mobile's Fort Charlotte https://en.wikipedia.org/wiki/Battle_of_Fort_Charlotte.
We begin this Dauphin Island story of the American Revolution when the U.S.S. West Florida, commanded by Captain William Pickles, first dropped anchor near the ship channel off Dauphin Island in February of 1780. Captain Pickles and his U.S. Navy ship were accompanied by a huge convoy of Spanish ships. The Spanish convoy which had sailed from New Orleans in January but had been delayed by both the action of storms and by being becalmed. This fleet carried almost 800 soldiers and sailors on board 13 ships consisting of a merchant frigate, 4 row galleys, a sloop, a packet boat, three brigantines, a frigate of war, a galliot and a royal brig.

The mission of this enormous amphibious force anchored at Dauphin Island was to secure the strategic main channel at the mouth of Mobile Bay and  taking advantage of this position during the capture of Ft. Charlotte in Mobile. The conquest of Mobile was part of Spanish commander Bernardo de Galvez' plan to use Mobile as a supply station for his anticipated successful attack upon Pensacola insuring a Spanish conquest of all British West Florida. This would mean an end to British harrassment in the Gulf for American smugglers from the Atlantic Coast who were moving war materials for the Continental Army from New Orleans, Havana and other southern ports through the British blockade of American harbors on the Atlantic.