CHAPTER XV. Oglethorpe pays particular attention to internal Improvements--Meets with many annoyances--The Creeks, under Toonahowi, make an incursion into Florida--The Spanish form a design upon Georgia--Some of their fleet appear on the coast--Oglethorpe prepares for defence--Applies to South Carolina for assistance--Spaniards attack Fort William--Dangerous situation of Oglethorpe--Spanish fleet enter the harbor and land on St.Simons--In three successive engagements they are defeated--A successful stratagem--Enemy defeated at Bloody Marsh--Retire and attack Fort William, which is bravely defended by Ensign Stewart--Spanish forces, repulsed in all their assaults, abandon the invasion in dismay, and return to St.Augustine and to Cuba,.