The Siege of Mersadie Hive was a custom scenario lovingly crafted by Arthur. As such, unless your GM is planning to borrow the scenario by hacking together what they hear on this episode and the notes on Arthur's blog, there's really no spoilers to worry about.
As always, be aware that the podcast is not really family-friendly, and features some background noise, if that sort of thing bothers you.
There are two links today, because one entire play session happened in between episodes 4 and 5. I can't remember whether this occasion was due to me just forgetting the recorder, or the batteries being unexpectedly dead. It's tragic, because we lost a very enjoyable episode full of Underhive frolics and hot scout-on-ork action. I decided to record a brief summary of the session's events so that later references would make sense, but mostly just so any keen listeners out there wouldn't miss out entirely. For more on this session, see Refereeing and Reflection.
Incidentally, if there are any keen listeners out there, do say! As far as I know the only people listening to these also took part, which is a teensy bit demoralising.
There's been quite a bit of planning and strategising during this game, which I very much enjoyed, but possibly isn't fascinating listening if you weren't part of it? Hard to tell. Here it starts to pay off, as the actual fighting starts and we try to come up with clever ways to massacre aliens. This isn't the first thing that comes to mind with 40K games, but is actually quite in keeping with those parts of the source material that are more about strategy than skirmish tactics. Following experiences fighting tyranids, and bearing in mind that we're fighting several thousand orks at a time as part of a huge war front, a lot of this involves using resources at our disposal to direct the battle, rather than immediate personal intervention, but I'm fine with doing that sometimes. It's fitting for space marines not just to be all about bolt shells to the face; they're masters of war, not just competent killers.