the governor, luis muñoz marín, declared martial law. the puerto rico national guard, under the command of the puerto rico adjutant general, major general luis r. esteves, used p-47 thunderbolt attack aircraft, land-based artillery, mortar fire, and grenades to counterattack the nationalists. the planes machine-gunned nearly every rooftop in the town. after the nationalists were forced to surrender, the puerto rican government made mass arrests.