I remember a game my grandparents had, but I have never found it searching on the web.
This game was likely made in the 1970s, it was 2-player.
It had a green board that was injection molded plastic, it had a set of plastic castle towers and a cardboard castle wall as a divider. The top of the main board was a grid of holes, underneath the holes were interconnected by a network ducts.
The pieces were little soldier-shaped plugs that fit in the holes. It also had two colored air plungers.
The game mechanic was a bit of a cross between checkers and Battleship. You moved a piece and were allowed to plunge a hole as turn elements. If you plunged a hole on your side and the adjoined hole on the opponents' side had a piece in it, it would fly out and be removed from play.
Has anyone heard of or played this game?