Chard: You think the Welsh can't do better than that, Owen?
Private Owen: Well they've got a very good bass section, mind. But no top tenors, that's for sure.
Toward the end, there is a lull in the battle. During that time the Welsh and the Zulus sing the war songs of their respective cultures. Depending on how you see it, this is either a moment of primordial kinship (sort of "All warriors are brothers") or the most badass thing ever to happen in Welsh history. Or possibly both.
Further on that note - any scene where the Zulus are singing. Hundreds of sonorous voices reverberating off the hillsides, beating their shields as they charge? Epic.
Pretty much everything Color Sgt. Bourne does or says. "Alright then, nobody told you to stop working!"
There is the climatic battle as the hopelessly outnumbered British fight their enemy's seemingly overwhelming numbers with the intelligent kind of disciplined force multiplier tactics that were sorely missing at the Battle of Isandlwana.