On August 30, the "Katipunan" attacked the 100 Spanish soldiers defending the powder magazine in the Battle of San Juan del Monte or Battle of Pinaglabanan. About 153 Katipuneros were killed in the battle, but the "Katipunan" had to withdraw upon the arrival of Spanish reinforcements. More than 200 were taken prisoners. At about the same time, Katipuneros in other suburban Manila areas, like Caloocan, San Pedro de Tunasan (now Makati City), Pateros and Taguig, rose up in arms. In the afternoon of the same day, the Spanish Gov. Gen. Camilo de Polavieja declared martial law in Manila and the provinces of Cavite, Laguna, Batangas, Bulacan, Pampanga, Tarlac and Nueva Ecija. The Philippine Revolution had begun.