Whitman looks across the Atlantic at revolutionary France and hears not just cannon fire and collapsing buildings, but a newborn wailing. He walks his own shore, haunted by the carnage—blood in gutters, heaped corpses, firing squads—yet feels strangely still. The horror does not sicken him as it might, because he sees it as a long-overdue delivery. The speaker’s mood is grim acceptance mixed with electric anticipation; he refuses to wish humanity numb or justice absent, even when vengeance is terrifying.
By the poem’s close, that electric note takes over. He calls Liberty his mate and vows to translate the violence into a triumphal song. The east wind brings the noise of new instruments, a free march that will drown every interruption. The mood swells from sorrowful awe into something like joyful madness, anchored by perfect trust in what the bloody birth will become. It’s a love letter to Paris, brutal and tender, convinced that music is latent in the wreckage.