...Galt's Grenadiers? Of StarDate and late-BattleTechnology fame?
Yep! Straight out of BattleTechnology Magazine #9

Finished the first scenario, after 5hrs of play. Got some luck by shooting down the Thunderbird (failed control roll), then I managed to take advantage of cover, range and the heavy rain to inflict damage while avoiding trouble, or at least distributing it evenly among my units.
I repelled the Capellans with the single loss of a Dragon, but I have to admit that my son got a very bad streak of rolls (it seemed the Hornet was almost impossible to hit). He's already putting up his forces for the next scenario, and he is very determined to take revenge.
I'm working on it, expect it to appear here soon.
On a side note: I don't know about you, but I felt some conflict in playing wargames with my son now that war is a very real thing, not so far away. I thought about it, but then decided to go on. The first thing is that BT is a very abstract game, it's just like chess but with 'Mechs

We move counters on a hex map, roll dice and have fun together. The second thought is that I can teach my son something about war. That even if you win, you are always losing a lot: a lot of good men and resources. That one day you may end up as a winner, but next day you might lose everything. Even more important, that often whoever wins becomes the owner of a damn big pile of rubble where cities, industries... life used to be. Everybody loses. We comment our battles and he asks me about the real war, because he struggles to understand why people would do that for real. When we look at the rosters of our battles, it is obvious even for a child that the war is such a huge waste - even without considering the enormous and longlasting suffering it causes.