We've seen these iconic scenes in movies like Braveheart, Henry V, and even movies set in ancient times, such as Alexander. Did these types of speeches ever actually occur? Also, with the large size of some of these armies, would it even be possible to give a speech such that the entire army would hear?
hi! yes, battlefield speeches are a real thing - you'll find a few examples in the FAQ (although there have been tons more threads on this, so might be worth a quick search if you want more examples)
as for being heard, you may be interested in this section
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