3. The strength of the respective forces.
Col. Tourtellotte's command was composed of the Ninety-Third Illinois, officers and men, 294; the Eighteenth Wisconsin, guns, 150; Fourth Minnesota, guns, 450; the Fifth Ohio Cavalry, men, 16; giving an apparent total of 910. To this must yet be added the force for the six pieces of artillery, not less than 60. If we add the company officers not enumerated, it will be found that Tourtellotte had about 1,000 officers and men. The above numbers are official.
Corse's official statement is that he brought with him to Allatoona the Thirty-Ninth Iowa, 280 men; Seventh Illinois, 267 men; Fiftieth Illinois, 267 men; Fifty-Seventh Illinois, 61 men; Twelfth Illinois, 155 men; or 1,030 men. To this must be added (say) 107 regimental and company officers, making the force that he brought with him 1,137 officers and men. So with Tourtellotte's troops the aggregate is 2,137 instead of 1,944 as reported by him, which excluded himself and officers.
As regards the strength of my division at Allatoona, the War Records show that on September 20, at inspection, I had present for duty 331 officers and 2,945 men. Total, 3,276.
Cockrell's Brigade was composed of eight small regiments consolidated into four, Ector's Brigade of six regiments, and Sears's Brigade of six regiments, and two batteries, 8 guns.
To this force add one four-gun battery sent with me, and deduct one gun and one regiment left at Allatoona creek bridge, and my entire force present was 3,197.
And thus officially we have Federals, 2,132; Confederates, as above.
4. Equalization of forces.
The ratio of inequality between a force within ordinary intrenchments in line of battle and the attacking force without is well known.
Gen. Cox in his "Atlanta Campaign," page 129, says: "One man in the trench is equal to five in front." Gen. O. O. Howard, in reference to the battle of Kennesaw Mountain, says: "My experience is that a line of works thoroughly constructed, with the front well covered with abatis and other entanglements, well manned with infantry, whether with our own or that of the enemy, cannot be carried by direct assault." Gen. R. S. Granger informs Gen. G. H. Thomas that the fort at Athens, manned by 700 men, can hold out an enemy 10,000 strong. (War Records, V. 39, Part 3, page 519.) Vicksburg, Jackson, Cold Harbor, Kennesaw, Petersburg, Atlanta, Knoxville, and other lines repelled the assaults. Now Allatoona was, without doubt, thrice as strong as these, and the attacking force was only one and a half to one inside. Then, too, we should consider that the works on the hills were almost inaccessible.