I remember someone noting a while ago that Deluge was too easy for its place in the game. In my Ironman campaign I've just found a reason to reevaluate that - due to timeout I lost my full squad (all except my main heavy and my MEC, as they were wounded at the time). My star Sentinel sniper was critically wounded (stabilised, but I couldn't bring her home), my Support was killed (a familiar feeling, but this guy had lasted a while), while Zhang and my assault had made it all the way to the truck but not triggered it because there were still aliens alive - they couldn't physically get all the way back in time. Only my former covert agent (filling in for one of the wounded soldiers) made it out - at least she's a sniper major, but not with the advantages of the previous one. It's not critical to the campaign, I don't think, because I've already completed all the really difficult missions (and won't be getting the final Progeny mission now - shame, I need the soldiers) and have almost full tech, but it's a huge setback to lose three colonels.