...hours. Several attacks on the centre were gallantly repulsed by Colquitt's brigade, and Rodes maintained his position against heavy odds with the utmost tenacity. Longstreet, leaving one brigade at Hagerstown , had hurried to the assistance of Hill, and reached the scene of action between three and four P. M. His troops, much exhausted by a long, rapid march and the heat of the day, were disposed on both s...