I wonder if he is related to my family. My grandfather, William Augustus Glover, was a Secret Service operative on the White House detail during the Teddy Roosevelt, Taft, and Wilson administrations. My late mother would have probably known as she was the family historian. She put together a family book- I'll have to check.
He would've likely been your grandfather's grandfather. That shouldn't be too hard to check, but wouldn't such a famous ancestor as Gen. Glover be known in your family?