Note † — II. THE FIGHT AT FINNSBURH:
Reading edition
l. 174. The gerundial inf. with tô expresses purpose, defines a noun or adjective, or, with the verb be, expresses duty or necessity passively; cf. ll. 257, 473, 1004, 1420, 1806, etc. Cf. tô + inf. at ll. 316, 2557.