Consider these lines from "Vigil Strange I Kept One Night" by Whitman.
Vigil strange I kept on the field one night;
When you my son and my comrade dropt at my side that day,
One look I but gave which your dear eyes return'd with a look I shall never forget,
One touch of your hand to mine O boy, reach'd up as you lay on the ground,
Then onward I sped in the battle, the even-contested battle,
Why does the speaker of the poem refer to the word 'son' in the second line?

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