Assassination Trivia

[RJNorton]

This letter was found somewhere. Where was it found?

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ST. Louis, October 21, 1864

DEAREST HUSBAND: Why do you not come
home? You left me for ten days only, and
you now have been from home more than
two weeks. In that long time, only sent
me one short note a few cold words and
a check for money, which I did not require.
What has come over you? Have you for
gotten your wife and child? Baby calls for
papa until my heart aches. We are so lonely
without you. I have written to you again
and again, and, as a last resource, yesterday
wrote to Charlie, begging him to see you and
tell you to come home. I am so ill, not able
to leave my room ; if I was, I would go to
you wherever you were, if in this world.
Mamma says I must not write any more, as
I am too weak. Louis, darling, do not stay
away any longer from your heart-broken wife.