Question

which lines tell us that soldiers of the light brigabe were really efffective in their attack ?

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Answer 1

Line 34-36

This poem is describing the Crimean War, when Britain and its allies were fighting the Russian Empire. The Cossacks were famously fierce soldiers allied with the Russian Empire. The soldiers of the Light Brigade are so effective that these enemies are "shattered" and "sundered" (which means broken in two).