Simon's surname has been engraved as Whithouse on his military tombstone. His Civil War military and pension file has surname spelled multiple ways: Whithouse, Withaus, Witthaus, Withus.
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Germany, Select Births and Baptisms,
Name: Simon Ferdinand Witthuss
Gender: Male; Baptism Age: 0
Birth Date: 13 March 1841
Baptism Date: 21 March 1841
Baptism Place: Sankt Stephani Evangelish, Vlotho, Westfalen, Prussia
Residence Place: Johann Friedrich Wilhel Witthuss
Mother: Sophie Friederike Windmeier
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The following was added by the FAG manager who created Simon's memorial.

The 49th Missouri Infantry Regiment (Union Army from Missouri).

The following information is from The Civil War Archive, 2009. Retrieved from http://www.civilwararchive.com/Unreghst/unmoinf4.htm#51

Organized at Warrenton, Mexico, Macon and St. Louis, Mo., August 31, 1864, to February 5, 1865. Attached to District of North Missouri, Dept. of Missouri, to February, 1865. 2nd Brigade, 3rd Division, 16th Army Corps (New), Military District of West Mississippi, to August, 1865. Dept. of Alabama to December, 1865.

SERVICE.--Duty in Northern Missouri on line of Northern Missouri Railroad, until January 30, 1865. Moved to St. Louis, Mo., January 30-February 1, thence to New Orleans, La, February 10-21. Campaign against Mobile, Ala., and its defenses March 17-April 12. Siege of Spanish Fort and Fort Blakely March 26-April 8. Assault and capture of Fort Blakely April 9. Occupation of Mobile April 12. March to Montgomery April 13-25, and duty there until July 14. Companies "A," "B," "C," "D," "E," "F," "G" and "I" ordered to St. Louis, Mo., and mustered out August 2, 1865. Companies "H" and "K" on duty at Eufaula, Ala., until December, 1865. Mustered out December 20, 1865.

Regiment lost during service:
4 Enlisted men killed and mortally wounded and 96 Enlisted men by disease. Total 100.