Wait, does Enemy A control Army A? It's not clear to me. Can you reword it to make that unambiguous.

Enemy refers to Enemy units. Army refers to my units.

Enemy A, Enemy B = two enemy units controlled by whoever.
Army A, Army B, Army C = three units that I control

Reworded;

An enemy unit is attacking one of my units with support. The unit they are attacking attacks the supporting enemy with support from another unit I control. In addition, a third unit I control moves into the territory the supported enemy attacks.

The result I'm hoping for is that I displace the supporting enemy unit, and my reinforcements bounce against their now unsupported attack, keeping them out of my territory.

However, I'm concerned because typically you can't cut support from the territory that is the target of the supported attack.

6.D.17 - Passed
TEST CASE, DISLODGEMENT CUTS SUPPORTS

You will dislodge the supporting enemy and bounce Enemy B with Army C.

Here is the link with the rule and an illustration to help. It's under rule 6.D.17
http://webdiplomacy.net/datc.php#section4

Thanks man.

Could you also tell me what happens in another situation?

An enemy is attacking my unit with support. My unit supports another unit of mine to attack their supporting unit. My assumption is everything bounces?

If you attack the supporting unit, you will dislodge it.
If you attack the attacking unit, it will bounce.

In your fist situation, you were attacking the supporting unit. Therefore you dislodge it and the attacking enemy no longer has support, which is why you can bounce them with an unsupported unit.

In this second case, there is no unit to bounce the attacking enemy, so your attacking unit will fill in the supporting enemy unit, and the attacking enemy unit will fill in where your attacking unit used to be.

Thanks a lot man

No problem. Feel free to shoot some more questions if have have any more.

I don't think Yoyo is correct, if I'm reading the second case right- here's a situation that I think the second case describes:

France (enemy)
Tyrolia->Munich
burgundy supports Tyrolia -> Munich

Germany (you)
Ruhr->Burgundy
Munich supports Ruhr->Burgundy

If that's your situation, then both supports are cut by the moves, and no units change position- which means you're right, everything bounces.

(He is, of course, completely right about the first case).

@ATC
You are correct, I read the situation incorrectly. I thought the unit his enemy attacked was his attacking unit, but yes, if you both attack each other's supporting units, or you both attack each others attacking units (when no support is cut), it will bounce.

I also have a question: Are these rules official Diplomacy rules? If I were to go to a FTF tournament, would all of these rules apply?

Yes, all of these rules would apply, and are in the Diplomacy rulebook.

The convoy paradoxes (eg, what happens if you attack a unit supporting an attack on a convoy with the convoyed army) I think might be different depending on which version of the Diplomacy rules you use - but as far as I am aware, everyone adjudicates that the way the DATC recommends (ie, a convoyed attack can't cut support against any of the fleets in the convoy).

Sometimes tournaments will have rulings for which provinces are meant by which abbreviation - eg, Nor for "Norway" (and not North Sea or Norwegian Sea, or any of the other provinces starting with "nor"). The FTF tournaments I've been to in Australia are generally pretty relaxed about naming, as long as it's clear what you mean.

Having a published list of common ambiguous provinces and what they mean at this tournament is nice though - although "liv" for Liverpool or Livonia isn't going to cause confusion, even with crazy convoys, so I would be unimpressed if someone asked the tournament director to rule it invalid.

Not everyone is so relaxed though - Valis has a tale about having his order of Con->Bul(nc) ruled as invalid (because the board reads "east coast" not "north coast"). Again, I think that's kind of disappointing - it's clear which coast is the north coast, and "north coast" is what some online interfaces (including webdip) use.

The moral here is to make sure you're writing your orders clearly and unambiguously, then you don't need to have these arguments :)