@Simon-Hibbs
If you are having problems with the latest versions of TripleA (as I am)

For AI testing Im using
https://github.com/triplea-game/triplea/releases/tag/2.7.15256

Currently I have 7 versions of TripleA on my PC
This is old but is still valid, if you did not know how to do it 😉
https://forums.triplea-game.org/topic/3724/how-to-have-triplea-2-5-2-6-installed-at-the-same-time

@madvitale

I'm sorry that you are having troubles. I personally do not use Notepad, it's okay for small quick edits, I use Notepad++.
I'll include a zip file with the changes.
World_At_War.zip
Special Note "Transport Casualties Restricted" value must stay false in the xml as Transports and B.Transports have a defensive value. The value can be changed in the 'Map Options' (lowest button on the left panel).

Cheers...

@lafayette That works.