bullet2 All along the watchtower

"All along the watchtower" = (From the vantage of their watch against perfidy / evil / damnation?)

(cf. "The Watchtower" - name of Jehovah's Witnesses' evangelical periodical) -- (Like "the watchtower" in Stanza Three = from God's adjuration that humanity be watchful [for a second coming?])

(Overtones of Book of Revelations?)