Final answer:
The repetition of the phrase 'Charge of the Light Brigade' highlights the inequality between the British cavalry and the heavily armed enemy in the poem.
Step-by-step explanation:
The repetition of the phrase 'Charge of the Light Brigade' is used in the poem to highlight the inequality of the opposing sides. One side consists of a team of 600 cavalrymen on horses with swords, while the other side is an army equipped with lots of cannons.
The repetition emphasizes the contrast between the light brigade and the heavily armed enemy, underscoring the bravery and sacrifice of the British cavalry in the face of overwhelming odds.