Abraham Lincoln was generally a patient man. However, certain events, mostly the actions of his generals, caused his temper to flare.
General George McClellan seemed to specialize in irritating his President.
After the Battle of Antietam, McClellan concerned himself with the administrative details in his army. In one telegram to the War Department, he lamented that the horses in the Army of the Potomac suffered from fatigue and endured sore tongues.
In exasperation, Lincoln fired back,"General, what have the horses done since the Battle of Antietam to fatigue anything?"
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