How does the poem the Shield of Achilles contrast the ancient and the modern times?

Critic Scott Horton argues that the poem has contemporary resonance for Auden and his audience, reflecting a warning about the Cold War and the authoritarian warmongering of the 1950s: “Auden is not portraying the tragedies of the last war as such. He is warning of a world to come in which totalitarian societies dominate and the worth and dignity of the individual human being are lost. He warns those who stand by, decent though they may seemingly be, and say nothing.” This perspective is supported by anachronistic images on the shield. Thetis sees a scene that seems more like one from the Second World War: barbed wire around a military base. Modern war engages “millions” and spreads propaganda through “statistics.”