I am confused about the following scenario and how to resolve it:
There is an Italian submarine in Sea zone 13.
My opponent has a factory in Morroco/Algeria and deployed a US destroyer in Sea zone 13 using his factory alongside my submarine.
On Germany’s turn, I send in a subamrine and plane to seazone 13 to try to destroy the US destroyer.
What would the Italian submarine do (since it is not Italy’s turn yet, Italian submarine can’t decide to withdraw or stay and fight yet)
Will the Italian submarine fight alongside Germans? or defend?
Or will it just stay there and do nothing?
This is very perplexing to me and I would appreciate it if I could get a response - thanks.