...were unengaged on the 19th. As to the enemy's force engaged on that day, Rosecrans, in his official report of the battle, says, The reserve corps covered the approaches from the Chickamauga towards Rossville , and the extension of our left, and the fact, that at the close of day, we had present but two brigades which had not been opportunely and squarely in action, opposed to superior numbers of the enemy...