This piece of grafitti is something I saw mentioned on Facebook getting on for 7 years ago, and I never managed to find it. Then by total chance in lockdown I found it !
It;s getting extremely hard to read as the tree has aged, but says “Polish Forces 194?”
Facebook comments from a resident many years ago said :- there used to be an extensive camp at Dunsdale which was still visible when I was a kid. The Polish army was stationed there and they carved that beech tree.