I have this memory of a film from when I was a kid. It might have been a Harryhausen because I can see the monsters looking like that. But it was a place that was under attack by a monstrous threat and people being picked off at their leisure, a classical hero coming in and being sent off to tackle the source of the problem. I know this is the structure of Jaws/ Dracula/ Any number of things, but this was an old-timey movie and I’m sure it was that stop motion animation. Can anyone identify?