A-cræftan

According to the Old English Dictionary:

a-cræftan

p. de; pp. ed To devise, plan, contrive as a craftsman; excogitare :-- Úton ðeáh hwæðere acræftan hú we heora, an ðyssa nihta, mágan mǽst beswícan let us however plan how we can, in this night, most weaken them, Ors. 2, 5; Bos. 47,19. a-cræftan