[Puke]

yeah, allied ships wont engage each other at all. the combat screen wont come up when they enter the same square.

i believe that the attack command will still cause your ship to follow his, and so you could have a warship trail his escort. then you can tell him "turn that thing around or im going to cancel our treaty and blow it out of the sky"

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"...the green, sticky spawn of the stars"
(with apologies to H.P.L.)