"Fortress" begins with a paradox that it spends the rest of its length unpacking: "Sometimes you fail, / succeding most." Failure and success are not opposites here but twins. The poem imagines a person who has lost something outwardly, perhaps a chance, perhaps a place, and who has nonetheless been faithful to an inner territory, "some little island in your heart, / Some land you've sown." Its central idea is that the self is something you build and defend, and that the real victory (or defeat) happens where nobody else can see it.
The poem offers no biography, and it doesn't need one. The speaker addresses an unnamed "you," which makes the poem feel less like confession than like counsel, or perhaps like a person talking to herself. That "you" is first described as failing and then as hearing instructions: "Run back, run back, run back." The triple repetition has the stammer of panic or of a childhood chant, but the reply is flat and heartbreaking: "you never do." The sentence is ambiguous in a useful way. Maybe you never run back because you are proud; maybe because you cannot find the way.
That second possibility is what the middle of the poem explores. "Direction has no shape / it leaves no clue," the speaker says, and then the poem does something interesting: instead of giving directions, it offers a string of questions, each one a possible home. A "ledge, perhaps, in crags / plumed by the sea," "the cradle of the wind," "the night's star-wizadry." The spelling "wizadry" for "wizardry" may be a slip, but it sits comfortably in the poem's atmosphere of half-remembered enchantment. These images are grand and elemental, all height and weather, and they are offered tentatively, with question marks rather than certainty. The speaker is not describing a place so much as searching memory for the right shape of one.
Then the scale shrinks sharply. "A boy upon a hill . . . / red leaves . . . curled by the door / like cardinal wings, without / a sky to soar?" The ellipses make the lines hesitate, as though the memory is surfacing in fragments. Here the poem's strongest image arrives: leaves compared to the wings of a cardinal, bright red but grounded, beautiful things that cannot fly. The comparison carries the poem's whole sense of loss. Something that was made for motion, for a sky, is lying curled and still by a doorway. The boy on the hill, a figure of lost beginnings, stands behind it. Notice that the indented, ragged layout of these lines mimics the unsteady footing of the cliff and the hill, so the page itself seems to climb and slip.
The poem's formal choices support this drifting mood. It is loosely rhymed rather than strictly patterned. Early on, "known" and "sown" chime, and "ghosts" and "most" echo each other, which gives the first stanza a tight, almost proverbial finish. Later the rhyme loosens and the line lengths stretch and shrink, as if the speaker's certainty were dissolving. The closing stanza tightens again: "left" / "cries," then "own" / "alone." That final rhyme is the poem's thesis in two words. To "come to your own" is to return to yourself; to "win alone" is the price and prize of doing so.
The title makes the last turn. A fortress is a place of safety, but it is also a place you can be shut inside, or locked out of. The poem's twist is that the speaker has left it, and now the heart itself is calling: "Come back, come back." The heart that was a fortress has become a voice, a parent or a homing instinct, echoing the earlier "Run back" but now from the inside. The enterprise, the poem says flatly, "is yours." No one will rescue you, and no one else can claim the victory.
What gives the poem its quiet significance is this refusal to console. It does not promise that the way home can be found, only that the call will keep coming, and that answering it is solitary work.