Professor David Ferry probed each poet’s words, noting details, asking questions about them, keeping his students focused and vigilant, pointing to a surprise, a turn in syntax, an implication in an image overlooked first time through. I never heard him speak about Stevens’s “The Death of a Soldier,” but I imagine he would have discussed the brevity of the poem in relation to the large solemnity of the title, the short lines, the choice of a four-stanza structure, the relation of each...