While the battle of the strongpoints raged, 7 to 24 February, the 1st Cavalry Division was sweeping wide east, south, and west, around the city to Manila Bay. When the 37th Infantry Division crossed the Pasig at Malacanan Gardens, the 129th Infantry Regiment pivoted sharply west, campaigning toward the east wall of Intramuros. The 148th Infantry Regiment swung more broadly south, west, and north, bringing it up against the south wall of Intramuros. The 1st Cavalry Division swung on an axis parallel to these, but flung further out, around the whole city. Thus, the 1st Cavalry Division implemented a standard element of siege doctrine: isolate the defenders.