The Siege of Biak-na-Bato was commenced by Spanish-led colonial forces against Filipino revolutionary forces stationed in and near the caves of Biak-na-Bato Mountain Range which is part of the town of San Miguel in the province of Bulacan, Philippines in December 1897. Biak-na-Bato served as the capital of the provisional Republic of Biak-na-Bato, officially called Republic of the Philippines, led by Emilio Aguinaldo and his staff. Deemed near-impregnable, the Spanish-led troops and auxiliaries failed to make headway into the mountain range and cave defended by Filipino forces, resulting to a stalemate until both sides settled for a ceasefire which led to the signing of Pact of Biak-na-Bato which implemented an armistice between two sides during the Philippine Revolution that lasted until May 1898.
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