While you wait for responses to your question, you might find this similar post to be of interest: Do the speeches we often see before a battle in most literature and visual performances have any historical basis. Did the kings and generals leading an army ever give a speech to rally the troops. Or is this just a modern romanticism?. It has good answers by /u/Celebreth, /u/Quietuus, and /u/Thrasyboulus.

The short answer is apparently so. There’s dozens to hundreds of recorded battle speeches. There’s a question of how much of it is trope and how much of these speeches are exaggerated or embellished, and whether any number of specific speeches in particular were given as reported. But the basic fact that pre-battle speeches existed seems undeniable.