Poe structures the poem around a stark temporal contrast, announced by the italicized words Once and Now, which function as the poem's pivotal hinge. The former signals a lost pastoral idyll; the latter inaugurates a landscape of perpetual agitation. This before-and-after architecture allows Poe to dramatize the irreversibility of loss — the valley cannot return to its former stillness because the human community that animated it has been consumed by war, leaving behind only absence and grief.
The poem's central preoccupation is animate nature: trees "palpitate," clouds "rustle," lilies "wave" and "weep." Crucially, Poe insists these motions occur "by no wind," stripping away any naturalistic explanation and investing the landscape with a supernatural, sympathetic restlessness. The valley mourns not through human agency but through a kind of pathetic fallacy elevated to metaphysical principle — nature itself has absorbed the grief of the absent people and cannot cease expressing it.
The nameless grave at the poem's center is its most resonant symbol. It is unnamed, suggesting either collective loss (the war dead) or a deliberately withheld identity, which intensifies the sense of unresolved mourning. The violets above it are described as "myriad types of the human eye," a startling simile that collapses the boundary between the natural world and the human body, implying that the landscape has become a surrogate mourner, watching with countless eyes over the dead.
Poe's sound patterning reinforces the poem's emotional texture. The triple rhyme of "Hebrides" / "seas" / "trees" and the repeated suffix rhymes of "even" / "Heaven" / "driven" create a rolling, wave-like sonic effect that mirrors the ceaseless, restless motion described. The closing couplet — "Perennial tears descend in gems" — transforms grief into something crystalline and permanent, suggesting that sorrow is not transient but becomes a fixed, jewel-like feature of the world.
Thematically, the poem engages Poe's persistent concern with irrecoverable loss and the inadequacy of natural beauty to console the bereaved. The stars, trusted to "keep watch above the flowers," prove insufficient guardians; the valley's peace is shattered not by any returning army but by the very fact of departure and death. The poem thus meditates on how violence and absence permanently alter even the most remote and innocent spaces, leaving them in a state of eternal, unquiet mourning.