The theme of the poem is about the Bravery of the military unit .hence choice 1 is correct.
An emotional poem, The Charge of the Light Brigade, both honors and mourns the battle's action. The concept of the valiant and gallant British soldier—one whose moral obligation was to fight for justice—emerged during the Crimean War.
Tennyson honors a military unit's bravery for charging the enemy despite insurmountable odds: they are "six hundred" against an "army."
Hence the appropriate answer is Bravery.
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