In the Diplomacy board game, can player A issue a support order for a player B unit? Let's say player B has a hold order for his unit. Can player A use that unit for support in an attack? Basically, at any point under any circumstance can I "commandeer" an opponents unit to support my own attack, and in essence cut that support if he is also using it in an attack?

  • 1
    You can only issue orders for your own units. I'm trying to work out if I have misread the question but you seem to be asking if you can issue orders to units that aren't yours...
    – Chris
    Commented Oct 12, 2016 at 17:59
  • I'm with Chris. A specific example of the orders for player A and player B would help a great deal to clarify what you are asking about.
    – bwarner
    Commented Oct 12, 2016 at 18:54

4 Answers 4


No, you can only give orders for your own units.

The first sentence of paragraph 2, "Order writing phase" in the rules is, emphasis mine,

Each player secretly writes "orders" for each of his/her own units on a slip of paper.

  • With no rules reference or explanation, this is essentially an opinion comment rather than a legitimate answer (despite being correct). Another sentence or two by way of explanation, before I forget about this question, would garner an up-vote from me. Commented Oct 16, 2016 at 3:35
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    @ForgetIwaseverhere: I know, but I still feel this question needs an answer like this. Commented Oct 16, 2016 at 7:05

A nation can support another nation's units. You just need to coordinate and issue the correct orders. Remember, you need to be specific with your support.

Army in X supports army moving from Y into Z.

  • That's till inadequate - you must specify the territory from which the moving army/fleet being supported in its attack is moving (or being convoyed) from. Commented Oct 13, 2016 at 4:32

You can only send orders for your own units. You can use diplomacy to request another player to issue an order, but they are not required to do so.

You can issue an order to support a unit of another player (both move and hold). You can also convoy a unit of another nation.

But you can not support a unit that is attacking you.

  • "But you can not support a unit that is attacking you." Actually you can, but the order is voided by the attack (if I recall correctly).
    – Urhixidur
    Commented Oct 13, 2016 at 15:28
  • There are several versions of te rules. Some allow it some don't but the end is that it is voided. Commented Oct 13, 2016 at 20:24


The way to obtain the support of Player B's unit is to convince player B to write out the support order on your behalf.

Let's say you are France, allied with England against Germany. On the second turn, you move A Burgundy to Belgium, opposed only by a German fleet, Netherlands to Belgium. You want the support of the English fleet in the North Sea.

Even though you and England are allies, you can't write orders on his behalf. Instead, you must persuade him to write, F North Sea supports A Burgundy to Belgium on his own order card.

This is a good time to find out if England really is your ally. Maybe his order will be, instead, F North Sea supports F Netherlands to Belgium.

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    The nationality on your orders is unnecessary, and also troublesome as giving an excuse for an argument over the completeness of an order. The nationality of a piece being ordered or supported is always irrelevant - as it is always fully determined from the piece's start-of-move location. It is highly desirable to practice, and demonstrate, a minimally fully complete methodology for writing orders. Commented Oct 15, 2016 at 14:49
  • @ForgetIwaseverhere: That's not the way I was taught, but i respect your suggestion enough to follow it. Fixed.
    – Tom Au
    Commented Oct 15, 2016 at 18:01

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