Statistics for occurrence #1 of “Cairo B. M. Prentiss” in chapter 8.21 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War: The Opening Battles. Volume 1.:

...service was expiring. General John Pope was fully occupied in North Missouri with nearly all my disposable force, which was required to hold in check rebellion in that quarter. For the defense of Cairo B. M. Prentiss had 8 regiments, but 6 were three-months men, at the end of their term, unpaid, and unwilling to reenlist. At Springfield General Lyon had about 6000 men, unpaid and badly fed, and in need of cloth...
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Cairo B. M. Prentiss 6 6 0 0 0 user votes

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