I'm level 90,just taking missions from Preston trying to level up to get all Perks. I have completed story missions (of course) but got another defend the castle mission from Preston. The attacking enemies are the bos. I've got it 80% complete, but it won't progress any further. The radio operator says "the walls have been breached!!" but no enemies to be found. I've spent hours trying to fix this. Any ideas? I hope one of you guys will have an answer.

Might be a guy in power armor in the water.

Never thought of that. Thanks!

Just a thought. I know it's easy to get stuck against a 'sandbank' in the water, and NPCs are far from smart. The problem is; are you on the PC? Because if not, and I'm right, if he is deep enough getting rid of him might be troublesome.

yep, gotta search the outskirts and water. I bet its one facker just wading out there..hate that crap. lol

I'm on ps4. Getting rid of him will be a complete nightmare. But, at least you guys gave me a starting place. I really appreciate it!