...otal, 15,294 men. From this number in twenty-six brigades of the forty in Lee's army, the single rule of three will give us 23,523 men as Lee's strength in infantry and artillery at the battle of Sharpsburg . This is, of course, on the supposition that the ratio in the twenty-six brigades was the same for the other twenty-four. Let us examine this by the light from the reports of the brigades themsel...