Union Army Units at Port Hudson

There are various lists to be found of Federal units which participated in the battle, and there are differences in their content.  Some of the differences have to do with the particular date or period of time being described.
Two lists from respected books on the subject:
  Union Army Units at Port Hudson - May 27, 1863  (Lawrence L. Hewett's list for the battle of May 27th, from Port Hudson, Confederate Bastion on the Mississippi)
  Union Land Forces at Port Hudson - June 30, 1863  (David C. Edmond's list, effective 30 June, 1863, from The Guns of Port Hudson Vol. 2.)
List from the Port Hudson State Commemorative Area:
  Federal Units at Port Hudson

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