Bay tree

I’ve over watered my bay trees and now the leafs are brown, I’ve attached a photo.
I’m looking for advise on what I can do to bring theses trees back to life if it’s still possible. Many thanks.

 

When did you overwater them, are you sure that is the problem.
Do the pots have drainage holes?

 

Hi Pete
I had them in pots with no drainage holes and once the started to look like they were drying I took them out of the pots and realised they were full of water. It was about 3 months ago when I took them out. They are now in the original pots with holes

 

Doesn't sound good.
Scratch the bark on the stems and see if its green underneath, if it is there is still life but when you overwater they die from the root upwards so try scratching low down.