Allusion is illustrated through the entire poem.
Allusion is an brief and indirect reference to a place, person, thing, or idea of historical, culture, political significance, or literary.
Furthermore allusion doesn't describe in detail the person or thing it refers to.
Hope I helped ;)
Answer:
he feels nervous going to war
Answer:
The third example
Explanation:
O "And thinner, clearer, farther going"
