I believe you Coot!
And yes it's DF-BHD. I played some of the original Novalogic DF, shooting little pixels out of watchtowers etc. But gave up fairly quickly on BHD. Too much like Space Invaders, throwing bots at you, not enough OFP-style tactical stuff, which mostly spoiled me for that sort of shooter or those on rails, though I do still very much like H&D Deluxe.
How about this one?