Makes for a good "What If?" story. But unlikely that he recognized him as the future to be mass-murderer. Ditto that he would have told anyone, out of shame. And to my knowledge, Adolf was never nowhere near the frontlines. “Hitler served as a runner but, armed with new evidence, Weber realized that historians had not distinguished between regimental runners, a relatively safe job, and battalion or company runners, who had to brave machine-gun fire between trenches. Hitler was the former, a runner at regimental HQ, several miles from the front, and living in relative comfort.” https://www.theguardian.com/world/2010/aug/16/new-evidence-adolf-hitler