Be-trymian

According to the Old English Dictionary:

be-trymian

p. ede; pp. ed [be, trymian to fortify] To besiege, environ; circumdare vallo :-- Ðíne fýnd ðé betrymiaþ circumdabunt te inimici tui vallo, Lk. Bos. 19, 43. Ge geseóþ Hierusalem mid here betrymede ye shall see Jerusalem besieged with an army, 21, 20. be-trymian,betrymian