I was wrong- The author is NOT related to the General-
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“I am not related to Gen. James Birdseye McPherson. I did have two Civil War ancestors: a great-grandfather, Luther Osborn, who enlisted in the 93rd New York Volunteer Infantry in December 1861, rose to corporal, became a lieutenant in the 22nd U.S. Colored Infantry in January 1864, rose to captain in that regiment; and a great-great-grandfather, Jesse Beecher, who enlisted in the 112th New York Volunteer Infantry in August 1862, rose to sergeant, died of typhoid fever in April 1865, is buried in the National Military Cemetery at Wilmington, North Carolina.”
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https://www.thedailybeast.com/25-years-of-battle-cry-of-freedom-an-interview-with-james-m-mcpherson
I could have misunderstood him.