+525.+ The exclamation point should be placed after words, phrases or
sentences that express strong emotion. For example:
Oh! When shall peace reign again?
Alas! I am undone!
To the firing line! the battle rages!
+526.+ Ordinarily the exclamation point is placed immediately after the
interjection or word used as an interjection, but frequently when the
strong emotion continues throughout the expression, the exclamation
point is placed at the close of the sentence instead of after the
interjection, even though the interjection comes first in the sentence.
For example:
On, Comrades, on!
Charge, Chester, charge!