Jul. 23, 1862 Annapolis Anne Arundel County Maryland, USA
"History of the 103d regiment, Pennsylvania veteran volunteer infantry 1861-1865" by Luther Samuel Dickey. Battle of 7 Pines or Fair Oaks page 13-22 page 390 - "Matthew McNees mustered into service Dec 16, 1861; wounded at battle of Fair Oaks May 31, 1862, died July 3, 1862 of wounds, at Annapolis, Md. buried at National Cemetery, Annapolis; grave 1892."
Private 103d regiment co. I
dates of Matthew's death vary from July 3, July 23, and July 26. Family dates read July 23. I believe the date July 3 is a typo for the book "History of the 103d regiment and the date July 26 1862 is the date that he was buried. His headstone has the last name spelled McNess.
Info from "McNees" family genealogy book. Matthew was born in Cherry Township. Son of Marcus and Martha (Adams) McNees.