Four hundred of the new party signed an agreement to hold the fort "for the present Protestant power that reigns in England," and a committee of safety of ten of the city freeholders assumed the powers of a provisional government of which they declared Jacob Leisler to be the head. They commissioned him as "captain of the fort." In this capacity, he began to repair the fort, strengthening it with a battery of six guns beyond its walls. This was the origin of the public park known as the Battery in Lower Manhattan. Thus began Leisler's Rebellion.