What did Union General George Meade do that enabled his forces to win at Gettysburg on the third day of battle? He attacked Confederate lines on all fronts. He hit Lee's forces with artillery. He guessed what Lee was going to do. He brought in unexpected reinforcements.
George Meade had his reserved men placed behind the center of his line on cemetery ridge right before they were going to be over run. This in turn overwhelmed the Confederates and lead to victory.
