Günther Thomson married Maria Barbara, the widow of Martin Wittmann. They and her children (Martin Wittmann, age 6; Julianna Wittmann, age 4) immigrated to Denmark (Schleswig-Holstein) arriving in the city of Schleswig on 9 May 1761.
They departed the Danish colonies in May 1764 and joined the migration to Russia. They settled in the Volga German colony of Grimm and are recorded there on the 1775 census in Household No. 163.
Günther Wittmann is recorded on the 1798 census of Grimm in Household No. Gm157 along with a note that he was working in Katharinenstadt.