 Complete the following phrase:  The fort, throughout its history has been vital to the protection and control of the Dominican Republics second city, Santiago, and by extension the entire Cibao Valley region. After Independence from Haiti and fearing a repeat invasion by Haiti, then president Pedro Santana requested the re-annexation of the Dominican Republic to Spain in March 1861. As such, Spain sent 4 infantries under the command of Colonel Ramon de Portal y Santo Domingo to occupy the fort. Santanas decision was not popular amongst a Nationalist movement and the 