One of my opponents skipped a turn and thinks they can win if that didn't happen.
I have never actually done this, but apparently it is possible:
http://www.wargear.net/wiki/doku.php?id=general:faqs#how_do_i_start_a_rematch_of_a_game
Might be a premium feature.
Thanks that is just to restart the match.
It can be used to restart the game from any turn.
Go to the games view page (like this one http://www.wargear.net/games/view/782413
and click on "view log" (get a page like this one http://www.wargear.net/games/log/782413
Click on the orange circle in the far right column to start the game from that turn