The narrator's mother becomes the child in her illness which has emaciated her body to look like a "childish skeleton." The son cares for the mother in every way: bathing her, carrying her, feeding her with a spoon. But this is caregiving with a twist--the mother is likened to a weakened enemy and the luck of caring for her is the luck of having finally gained power over an ancient enemy.

So although the physical acts of caring are done well--lowering her gently into a warm bath and soaping her withered body, sitting by her bed, feeding her ice cream--the thoughts behind such acts are less than pure. At one point, the son holds his wet mother in midair between bath and wheelchair until she begs him to put her down, an act which he recognizes as cruel and also an "ancient irresistible rejoicing / of power over weakness." The poem concludes on a more positive note--affirming the bond between mother and son and realizing that enemy or no, to feed someone ice cream is still an act of nurturing: "sweet is sweet in any language."