During the fight, two of the players began texting each other about how difficult it was and how they should just run away. One of those players later complained about how another group she knows about is having a great time, roleplaying and doing interesting things. While we just fight and don't accomplish anything.
I mean, in the previous session the mayor was assassinated, and I suggested they follow up on that - maybe try to find the killer, see what's going on at Town Hall, talk to the people behind it, follow up on leads about a potential plan to invade the town. But they wanted a combat with mindless undead, so they got to choose that.