Here-gang

According to the Old English Dictionary:

es;

here-gang

m. An irruption, attack by an army :-- Tó wiðscúfanne swá réþum heregange ad repellendas tam feras inruptiones, Bd. 1, 14; S. 482, 37, MS. B. [Laym. hire-ȝeong: Gen. and Ex. heregong military expedition: O. Frs. hiri-, heri-gong an attack: cf. Icel. her-ganga; f. a march.] here-gang