"For years afterwards" - Suggests how they have been there for a long time elucidating the impact of war.
Seemed forgotten.
"found them"-
The verb "found" suggests the soldiers were passive, inactive and powerless.
The pronoun "them" makes the soldiers anonymous as they don't have specific identities showing how destructive war can be.
"wasted young"- this metaphor refers to the soldiers who have lost their lives due to war.
The adjective "wasted" suggests a destroyed sense of youth and potential all due to a senseless war.It's a poignant way to convey the senseless sacrifice and devastation caused by conflict.
Overall in stanza 1 there is a sematic feild of youth and how war has destroyed nature.