Thanks to a friend, I got my hands on a video tape that had a mix-and-match of subbed and dubbed episodes of the OVAs.
This series is set in an alternate WWII-era universe. The axis and allies are still there, but they are also fighting a race of amorphous white aliens that come from the sky.
In order to combat these alien nasties, the Allies made a team of giant robots. The baddies (Nazis and Japanese) are working on robots too, but their intentions seem to be more for mass destruction...
The robots themselves are really neat. They are very different from the mecha you normally see (Gundams, GunBusters, Evas, etc.). The mecha in this series fit the "steampunk" mold, containing giant gears/pistons/fuseboards.
The OVAs also have a very nice soundtrack. The opener is an epic orchestral piece that sorta sounds like a train or something (fitting, because the first episode opens on a train). The timpani part sells it, with a rousing "chugga-chugga-chugga" riff.
There were some other nice songs too. There was one where this female vocalist was singing about toy soldiers dying or something like that. I can't really remember much else (it may have came from a subbed or a dubbed ep, but it was lovely.
If you're into steampunk/mecha in general, you should definitely check this out.