The group had been given the missions of collecting arms for the Liberation, distributing pro-Gaullist propaganda, inciting German draft resisters and French citizens avoiding the Reichsarbeitsdienst labor corps.
In 1933 he did voluntary work with the Freiwilliger Arbeitsdienst (a precursor of the Reichsarbeitsdienst) in Jedwilleiten at the Neman River delta and joined the SA.
Towards the end of the war Walendy was drafted first into the Reichsarbeitsdienst (auxiliary force), then the Luftwaffenhelfer (child soldier in the air force) and finally into the regular Wehrmacht (the German military).