I think the AI in general tries to help it's human allies once it enters the war, if it have access to the war or is capable of getting access. This is usually more than can be said about many human players.
Or posting about their observations of the game 11 months ago?Every one of you who said the AI is "dependable" or "excellent", is either a disgusting liar or playing on easy in derp-ville.
Bumping old threads is silly.
Even if your allies derp out, the enemy AI still considers the strength of your alliance when considering peace and war enthusiasm, so they aren't completely useless.
As for actually helping in your war? I haven't had that happen yet...