From the Guardian's obit on Edge:

Of his seemingly lugubrious piece Late Lament on that album, Edge, who also enjoyed a reputation as the group’s bon vivant, insisted that it was intended to be joyous and uplifting. “It’s a young boy discovering that he loves somebody for the first time, and he just wants to shout it out from the hills – and shout it out again!” he told Rolling Stone in 2018.

So not exactly an anti-war song then...