Even orcs have lungs.
“To be clear, the plan here is to run a 200m dash, then lift a heavy ladder, then rapidly climb that ladder and then be ready to immediately fight multiple Elven swordsmen. While probably still out of breath from the charge.Good luck. With. That.”
https://acoup.blog/2020/05/28/collections-the-battle-of-helms-deep-part-v-ladders-are-chaos/