With this order, you break your alliances with up to four realms. This is done unilaterally. The alliance will not be broken until the end of the turn, therefore you can not attack a former ally until the turn after this order is issued. Your former allies will be informed of the broken alliance and will not be taken completely by surprise.

Example: OPPOSE R1 R2
(Break your alliance with the Wolf Clan [R1] and the Cruel Lords [R2])