An inescapable obstacle to success in the warfare of mass armies was the Confederacy's lack of manpower, and sufficient numbers of disciplined, equipped troops in the field at the point of contact with the enemy. During the winter of 1862–63, Lee observed that none of his famous victories had resulted in the destruction of the opposing army. He lacked reserve troops to exploit an advantage on the battlefield as Napoleon had done. Lee explained, "More than once have most promising opportunities been lost for want of men to take advantage of them, and victory itself had been made to put on the appearance of defeat, because our diminished and exhausted troops have been unable to renew a successful struggle against fresh numbers of the enemy."