[quote name='Hydro' date='23 May 2010 - 08:33 PM' timestamp='1274672017' post='2309860']
There is no such thing as an invalid CB, hence this topic being pointless. There are, however, CB's that are less popular then others. The fixation in this game for "paper wars," where only alliances with treaties with each other can fight in a war is absurd. As a sovereign, independent alliance you have every right to enter into a war, with or without a treaty by virtue of the fact that you, and you alone, are the ultimate controller of your military forces. The need to legitimize your actions via a treaty, be it an ODP or anything else, is simply not necessary.
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This. Having a treaty is just announcing to the world ahead of time what will (or may in the case of an ODP) happen if someone attacks your treaty partner. That said, engaging in offensive warz w/o a treaty is generally frowned upon as band-wagoning, and will mark you in future dealings.