You are clutching at straws in order to preserve your stance. You are quite prepared to call a man, a man you never knew, a man who fought in the trenches so you could exercise the freedom, a liar.

Once more, none of us have heard from that man in the trenches.
We have heard from a 'news' agency, who heard it from his son, who heard it from the man in the trenches.

If it is true, we can never be sure.
If it is false (whether in whole, or in part)then we do not know at what point the untruth entered the sequence above.