I found the following to be most interesting regarding the flu epidemic of 1918 and Berkeley County. It's been some time since I read it, so don't recall if there's anything about a mass grave, but it is online at Genealogy.com. HISTORY OF BERKELEY COUNTY, WV BY WILLIS F. EVANS, 1928 - P.308, FLU EPIDEMIC, CHAPTER 27 Susan Curelop Lewis GRIMM and the KOGELSCHATZ family, Baltimore & Martinsburg