Probably the very first hex-grid wargame. Chris Crawford worked out many gameplay elements for a hes-grid system in the process of creating this game. Such things as calculating line-of-sight and an AI that could consider LoS and travel effectively on a hex-grid. Though not published, this was the basis for creating the later Tanktics for the PET computer.
The 1130 version was Human-vs-AI only but the KIM-1 version included turn based PvP mode. For speed purposes, parts of the KIM-1 version were ported to machine code for the PET by Chris Crawford while the 1130 FORTRAN was ported to BASIC for the PET by Dave Mencon.