At once > Immediately; together, simultaneously
3 With strokes of mortal steel without remorse,
remorse > {Compunction; mitigation; also: biting or cutting force (SUFQ; cf. 402.15:3)}
4 And on his shield like iron sledges beat:
sledges > sledge-hammers
5 As when a bear and tiger, being met 6 In cruel fight on Libyan ocean wide,
ocean > {A great expanse of anything; hence: desert}
7 Espy a traveller with feet surbated,
surbated > bruised, sore (from too much walking)
8 Whom they in equal prey hope to divide, 9 They stint their strife, and him assail on every side.