sentences:  Constrained by the limited supplies of ammunition and gunpowder, the bombardment had little material effect, though it prompted Massey to hastily erect a breastwork in the open ground of Friar's Orchard, at the south east corner of the city where the Royalist artillery was being concentrated.A Royalist attempt to cross the moat after dark was beaten back by musket fire.The objective of forcing the surrender of Gloucester by siege in ten days had failed, partly due to the city's resolve and Massey's spoiling attacks, but mainly due to the inadequacy of the Royalist artillery.