night, about eleven o'clock
Each side was preparing for the long , inevitable conflict . At day break , on March 25 , General MacArthur , leaving Hall 's brigade in the trenches and placing those of Otis and Hale on the firing line , which was over seven miles in length , made a brilliant charge along the entire front on the Filipinos ' breastworks about a mile and a half distant and constructed parallel to those of the Americans ' . Before night he had cut the Filipino army into hopeless fragments ; had advanced his own army over nine miles ; had inflicted a terrible loss upon Aguinaldo 's troops ; had demonstrated to them the difference between a determined American advance and an irresolute Spanish one ; and had taken up in earnest the invasion of Luzon , the capture of the Filipinos ' temporary capital , Malolos , the overthrow of their provisional government , and the establishment of American sovereignty throughout the entire archipelago . That night , about eleven o'clock , a nervous Filipino woman came walking down along the American out-post reserves which , during actual war , are usually only from 100 to 200 feet in the rear of the sentries . She reached Company `` G 's '' reserve of the 1st South Dakota Volunteers , where she was ordered to halt . She refused , but acted as though she did not understand . Drawing a large bamboo bonnet down over her face to conceal her identity , she mumbled something apparently to herself , and walked rapidly on .