Not exactly a speech, but you did ask about rituals. Some kind of Greeks, I can't remember which (I think it's the Thessalians), pretended to try and sacrifice a bull, which would fail. This would appear to be a good omen to the other side, and the rampaging bull would go over and they would try to sacrifice it. It would have been given an alcoholic beverage of some sort, so naturally when the opponents of the Thessalians ate the good bits of the bull, they all sprawled out drunk, ready to be butchered.
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