Theirs not to make reply/Theirs not to reason why/Theirs but to do and die
repetition suggests the soldiers' lack of control over their fate
while the soldiers' actions are heroic there is an undercurrent of tragedy in their unquestioning acceptance of a doomed mission
juxtaposition highlights the stark divide between the soldiers and their leaders
parallel phrasing creates a rhythm that mirrors the steady resolve of the soldiers, contributing to the sense of inevitability and unwavering commitment
encapsulates Victorian ideals of unquestioning duty, loyalty and honor