withal > also, in addition
2 That nothing, seemed, might bear so monstrous might:
That > [So that] seemed > [it seemed] so > such
3 The one upon his covered shield did fall, 4 And, glancing down, would not its owner bite: 5 But the other did upon his truncheon smite,
truncheon > broken lance
6 Which, hewing quite asunder, further way 7 It made, and on his acton did light,
acton > {Stuffed jerkin worn under chain-mail; later, a leather jacket covered with chain-mail} light > strike; fall, alight
8 Which dividing with importune sway,
importune sway > grievous force
9 It seized in his right side, and there the dint did stay.