Pampanga in the Philippine Revolution remained almost wholly loyal to Spanish suzerainty, with only few noble Kapampangan families defecting to the Katipunan. Kapampangan involvement in defending Spanish interests began when the Revolution broke out, with many freemen enlisting in Spanish forces. However, Tagalog rebels would eventually infiltrate the province and begin a campaign of terrorism. Once Spain lost the Battle of Manila Bay, Spanish forces in Pampanga retreated to Macabebe and awaited their return to Spain. Republican forces would raze and loot Kapampangan towns for their cooperation with Spanish forces. To revenge their losses, many Kapampangans would enlist with the Americans to defeat the Philippine Republic.