finding attackers

I was attacked twice by same person...however, when I tried to retaliate, he was an unknown. Name was typed in correctly.
Any ideas?

are you sure you typed in the name of your attacker correctly?

Make sure you're on the same server, first of all. Autocorrect may be automatically changing what you type, so try typing it in again and hitting the "x" in the bubble that pops up below your typing. Good luck!

can another server attack me? do you know a way to get an old war report. this has got me baffled and I don't give up ever ever

Another server can not attack you.
If typing his name into the locate on the map does not work, go to the war report and look at the coordinates from which he attacked you. That should work.
If you somehow do not have the war report, make sure you typed his name correctly, because:
1. Like Arythy said, the autocorrect might have changed it.
2. The person might have a different symbol, for example 0 (zero) instead of O (the letter o)