is solved by Clovis (vis in Latin is both power and you wish).

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20

How great in olden days my power,
Oft have I saved a castle tower
From war’s invading tide.
Transpose me, and how great my fall!
I am then the smallest of the small,
That nothing can divide.

is solved by Moatatom.

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21

The puzzle—

This compact Enigma take,
All apart its letters shake.
Let your 6, 3, 5 be high,
Like 5, 1, 2 do or die.
Who 4, 6, 5, 1 enjoys
More than 5, 6, 2 by boys?
While 5, 3, 2, 1 are mine,
May 4, 6, 3, 2 be thine.
4, 1, 5 is rich and rare,
6, 5, 1, 2 ends my prayer.

is solved by the word Enigma, from which are formed, as is indicated, the words aim, men, game, man, mine, gain, gem, and amen.