I think that all should stay where they are right? or is there any chance that T gets a retreat?

That's called beleaguered garrison. All units hold.

alright, great, thanks Pres Eden :)

This situation is covered by the following two rules:
Units of equal strength trying to occupy the same province cause all those units to remain in their original provinces (so A&B bounce with C&D); and
A standoff does not dislodge a unit already in the province where the standoff took place (the unit in T is unaffected and does what it would have done if there had not been a standoff in province T, i.e. in this case stand off in E and remain where it is in T).

So yes, all units stay where they are. In fact, what you have described is a standard way of protecting province T while still allowing the unit in T to be able to move.

HTH

Thanks FatherSnitch also, that is what I figured, just wanted to make sure

Yeah there a couple things going on there:

The army at T does not go anywhere, because it was bounced out.

Separate from that is the fact that A and B are attacking the T territory and so are C and D. They bounce, regardless of who is or isn't there.

So T holds, A, B, C, and D hold as well. E remains empty and whoever was also trying to get into E as well as T holds too.

It will look rather messy on the map though lol.

Tactically speaking, if you are T, that is a good place to be. Say the person trying to get an army to E is the guy who controls C and D. You made a good move by blocking it, because if you hadn't he would be able to disrupt the equilibrium next turn and end you, with no retreat possible.

but anyway. You understand it now so that ramble was fruitless.

The other thing to note is that even if C and D don't go for T, T is safe because you can't dislodge your own units.

Oh right I missed that I thought there were three people here not just two.