KI link: farmer at Cygnet River from 1908.
No record of service under that name, but he probably enrolled under a different name due to his German birth.
Evidence of enrolling:
Mr Herzog before leaving for camp
Show Notes. (1916, December 2). The Kangaroo Island Courier (Kingscote, SA : 1907 - 1951), p. 2. http://nla.gov.au/nla.news-article189506914
Also: The Expeditionary Forces. (1918, February 2). The Kangaroo Island Courier (Kingscote, SA : 1907 - 1951), p. 6. http://nla.gov.au/nla.news-article189505566 and other listing until 16 Nov 1918.
30 Mar 1886
Berlin
10 Nov 1959
Hd Talunga, SA
unmarried
Immigration 19 Dec 1908 Roon
Naturalization
20 May 1913
Naturalization Citation
(Secondary evidence)
Text: A1 1913/10530 Heinrich Herzog - Naturalization Access status: OpenLocation: Canberra 1913 - 1913 1582
Immigration Citation
(Secondary evidence)
Text: State Records SA. https://archivesuat.egigate.sa.gov.au/sites/default/files/documentstore/passengerlists/1908/GRG_41_34_0_830-1908_Roon.pdf
Death Citation
(Secondary evidence)
Page: Tal 900 7677
Text: Surname: HERZOG First Names: Heinrich Death Date: 10-Nov-1959 Age: 73 Gender: M Marital Status: S Place of Death: Hd of Talunga Residence: Hd of Talunga Relative: District: Talunga Book/Page: 900/7677 Notes: Symbol=I. An indefinite date of death e.g. if a range was given the earliest date was used