An army to be useful must be ...

An army to be useful must be a unit, and out of this has grown the saying, attributed to Napoleon, but doubtless spoken before the days of Alexander, that an army with an inefficient commander was better than one with two able heads.
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 William Tecumseh Sherman

Quotes from the same author

Courage - a perfect sensibility of the measure of danger, and a mental willingness to endure it.
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 William Tecumseh Sherman
I will accept no commission that would tend to create a rivalry with Grant. I want him to hold what he has earned and got. I have all the rank I want.
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 William Tecumseh Sherman
To those who would submit to the rightful law and authority, all gentleness and forbearance; but to the petulant and persistent secessionists, why, death is mercy, and the quicker he or she is disposed of the better. Satan and the rebellious saints of Heaven were allowed a continuous existence in hell merely to swell their just punishment. To such as would rebel against a Government so mild and just as ours was in peace, a punishment equal would not be unjust.
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 William Tecumseh Sherman
I beg to present you as a Christmas gift the city of Savannah.
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 William Tecumseh Sherman
If you don't have my army supplied, and keep it supplied, we'll eat your mules up, sir.
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 William Tecumseh Sherman