Mǽg-rǽs

According to the Old English Dictionary:

es;

mǽg-rǽs

m. An attack by men upon their kinsmen:--Wearþ ðes þeódscype swýðe forsyngod þurh morðdǽda and þurh mándǽda . . þurh mǽgrǽsas and þurh manslihtas this nation is sunk in sin through deeds fell and foul . . through attacks of kinsmen upon kinsmen and through manslaughters, Wulfst. 164, 4. mæg-ræs