sentences:  John Horse had been fighting alongside Osceola and acting as his interpreter by this time.When they were seized while under a flag of truce during negotiations with Jesup's emissary, Florida militia general Joseph Hernandez, John Horse found himself imprisoned along with Osceola and other members of his band at Fort Marion (Castillo de San Marcos), the old Spanish fort that formerly defended St. Augustine, the colonial capital of Spanish Florida.John Horse gained his initial fame for joining with a Mikasuki brave named Wildcat (Coacoochee), the son of the Mikasuki chief, King Phillip Emathla, in executing a daring escape from the fort which, until then, had been believed by American forces to be unbreachable.