On-gang

According to the Old English Dictionary:

es;

on-gang

m. I. an entrance:--Ongongas ingressus, Ps. Spl. C. 67, 26. II. an irruption, attack, a going with violence:--Ongong incursus, Wrt. Voc. ii. 111, 44: irruptio, 111, 47. Ongeong (-gong, Rush.), impetus, Mk. Skt. Lind, 5, 13. on-gang