jackson changed his attack plan. he placed his infantry around his guns on sandy ridge. kimball, not realizing that his forces outnumbered jackson's, attacked sandy ridge to silence the confederate cannons. at about four o'clock, kimball's infantry ran into jackson's stonewall brigade at the base of sandy ridge with heavy fighting. jackson only managed to hold his position even though he kept sending in more troops. the fight soon turned into a stalemate with neither side being able to push back the other. kimball began sending in union reinforcements and by six o'clock the confederates were running out of ammunition. at this point they began to withdraw. soon the withdrawal turned into a running fight that only ended after dark.