Beauregard reported the enemy's strength at 40,955.
According to the custom of enumeration in the South, this number probably excluded every man enlisted as musician or detailed as guard or nurse, and all commissioned officers--everybody who did not carry a musket or serve a cannon.

With us everybody in the field receiving pay from the government is counted.

Excluding the troops who fled, panic-stricken, before they had fired a shot, there was not a time during the 6th when we had more than 25,000 men in line.

On the 7th Buell brought 20,000 more.

Of his remaining two divisions, Thomas's did not reach the field during the engagement; Wood's arrived before firing had ceased, but not in time to be of much service.
Our loss in the two days' fight was 1,754 killed, 8,408 wounded and 2,885 missing.