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In page Spanish–American War:

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The following day, Glass sent Lieutenant William Braunersreuther to meet the Spanish Governor to arrange the surrender of the island and the Spanish garrison there. Two officers, 54 Spanish infantrymen as well as the governor-general and his staff were taken prisoner[citation needed] and transported to the Philippines as prisoners of war. No U.S. forces were left on Guam, but the only U.S. citizen on the island, Frank Portusach, told Captain Glass that he would look after things until U.S. forces returned.[1]