I think it looks like an error a 9 instead of an 8 .
Bit of a boo boo that, not too easy to correct a typo when it has been carved into stone!
Many people were injured in the war but did not die until months or years later so I don't think it was that, it is the time of the conflict that counts not the time they died.
Where is this village, there is a village called Barley just up the road from me, if it is that Barley I will have a look next time I am over there, my doctors surgery is in Barley.