 During World War II, Janes served in the Kriegsmarine and was able to continue playing, including spells as a wartime guest player with Wilhelmshaven 05 and "Fortuna Glückstadt" - both from towns with Kriegsmarine ports - as well as Hamburger SV where he played his last league match in November 1944.He captained Germany 31 times.Despite his age of 38, Janes almost would have had a comeback for Germany in the first international game after World War II in 1950, but he broke his foot shortly before and thus had to finish his career for good.