From the October 1982 issue of Compute! magazine:
Scott Adams's Adventure International sells a telecomputing game called Commbat. Commbat is a bit different than Megawars or Decwars; it allows only two players, but bypasses the need for a central computer. Instead, the players compete against each other using their own computers, linked over the phone lines by modems. Also, the game has graphics. The graphics are very simple, though, since Commbat allows Apple, Atari, and TRS-80 users to compete interchangeably, and those computers' graphics systems are normally incompatible.
I've done some pretty extensive Googling and am unable to find any record of this game having been released for the Apple II. Can anyone confirm?