John McMullan enlisted and served in the Revolutionary War. Gale Fuller discovered John's muster rolls and has added them to the McMullan Family web site.

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This muster card is dated April 8, 1778.
This muster card is dated May 2, 1778 and shows John to be at Valley Forge.
This muster card is dated April 3, 1778 and shows John to be at Valley Forge in the hospital.
This muster card is dated June 3, 1778 and shows John to be at Valley Forge and shows his enlistment to be a term of 3 years.