1850 census supports him as a son of Reuben (b. 1805) and Sarah Hagenbuch. Shows him to have been born in 1841, though.
Private Wm. Haugenbaugh (or Haugenbauch). Co E 28th Pennsylvania Infantry. Muster in 7 July 1861. Veteran. Re-enlisted 24 Dec 1863 at Wauhatchie, Georgia. 1st Brigade, 2nd Division, 20th Army Corps, Army of the Cumberland, to June, 1865.
KIA June 15, 1864. Originally buried near Pine Mt. with 4 other men of the 28th PA: Donovan, Hart, Raycraft, and Strain.1