Battle of the Hornburg, in the ravine of Hoof's Deep.
Braeburn: "I want every mare and strong colt able to bear arms, to be ready for battle by nightfall."
Braeburn: "We will cover the causeway and the gate from above. No army has ever breached the deeping wall or set foot inside the Hornburg."
Rainbow Dash: "This is no rabble of mindless zebras. These are the buffaloes. Their armor is thick and their shields broad."
Braeburn: "I have fought many wars, Miss Pegasus. I know how to defend my own keep."
Braeburn: "They will break upon this fortress like water on rock. Thunderhooves' hordes will pillage and burn, we've seen it before. Crops can be resown. Homes rebuilt. Within these walls, we will outlast them."
Twilight Sparkle: "They do not come to destroy Appleloosa's crops or homes. They come to destroy its people. Down to the last foal!"
Braeburn: "What would you have me do? Look at my men. Their courage hangs by a thread. If this is to be our end, then I would have them make such an end as to be worthy of remembrance!"
Twilight Sparkle: "Send out messengers, my lord. You must call for aid."
Braeburn: "And who will come. Pegasi? Unicorns? We are not so lucky in our friends as you. The old alliances are dead."
Twilight Sparkle: "Celestia will answer."
Braeburn: "Celestia? Where was Celestia when the trains were raided? Where was Celestia when our enemies closed in around us!?
Braeburn: "Where was Cel — No, my Lady Twilight, we are alone."