She placed, and so, without hurt or harm,
Line 23: "Her aged hand on his strong young arm"
Line 24: "She placed, and so, without hurt or harm,"
" Her aged hand on his strong young arm "
(The woman places her old hand on the boy’s strong arm.)
" She placed, and so, without hurt or harm, "
(With his support, she crosses without being hurt.)
Overall meaning: The woman takes the boy’s arm and begins crossing safely.