That's right. Glen originally had 3-4 more Dread Empire books he planned to write, before the already-written future material was stolen around 1989. He knew An Ill Fate Marshalling ended on a cliffhanger, and that readers wanted resolution.
So what Glen did was to condense parts of 3-4 books into 1, to give readers a taste of how it would have continued, and resolve the conflict of Bragi's fate.
In Glen's universes, there's always more story to tell. All of his series are "incomplete" in one way or another.