On-sǽge

According to the Old English Dictionary:

on-sǽge

adj. Falling upon, assailing, attacking:--Wé ǽr ðysan oftor brǽcan, ðonne wé béttan, and ðý is ðisse þeóde fela onsǽge. Ne dohte hit nú lange inne ne úte, ac wæs here and hunger, bryne and blódgyte on gewelhwylcon ende, Wulfst. 159, 7: 128, 14: 243, 2. Hǽðcynne wearþ gúþ onsǽge war had come upon Hæthcyn, Beo. Th. 4960; B. 2483: 4159 ; B. 2076. [O. H. Ger. ana-seigi infestus.] on-sæge