The Philippine Revolution began in 1896 as a war for independence against Spain but later transitioned to a war against the United States after it displaced Spanish control. Key events included Bonifacio's call to arms which sparked the revolution, early battles against Spanish forces, and internal divisions that led to Bonifacio's execution. The revolution achieved a brief respite with the 1897 Pact of Biak-na-Bato but hostilities soon resumed as both sides broke the agreement.