Having read a Hitler article that appeared in Pathfinder Magazine during the winter of 1937, a previously unknown German immigrant in New Jersey wrote to the editors and revealed that he had served with Hitler during the Battle of Chateau Thierry (May 31 - July 18, 1918). Perhaps the writer, Hans W. Thielborn, suffered some memory loss as a result of a head wound during the battle - but records show that the fight had been over for some ten days by the time the two interacted.
We'd be happy to hear your thoughts on the subject.
The article referred to can be read here.