I do not have any Civil War records for Granville McPherson, but the following is taken from Vol. 12, No. 298 of the Fort Worth Daily Gazette (Thursday, May 26, 1887):

“After his return from New Mexico he was engaged in the mercantile business until war was declared, when he nobly responded to the call for volunteers, and was among the first to take up arms in defense of his beloved Southland. During the latter part of the war he was in the engineer corps, under General S. B. Maxey. When peace was declared he went to the Indian Territory, where he engaged in merchandising and stock raising…in 1872 began the publication of the Oklahoma Star…In the masonic degrees he had almost reached the highest pinnacle. But few men in the United States have penetrated so far as he into the sacred mysteries of the noble order, and the only one who outranks him is General Albert Pike, the lawyer poet, his old-time neighbor and dear personal friend.”

Hope this is useful,

Richard