Arson
The legionarries making use of their defensive structures and the choked streets were able to absorb the hits being dished out by the Heeat family soldiers with relative ease.
The ditches filled with spiked stakes proved to be an annoying obstacle for Lord Parker's men, as they could not cross this gap to try and close the distance, so were forced to poke with their spear from behind this 'screen', which made their attacks less accurate and thus less effective.
Some of the more daredevil go getters did try to cross this 'spiked ridge' by throwing their shield over the gap to form a bridge and trying to cross it.
But such efforts were never coordinated properly due to the ambient darkness and thus ended bloodily for the experimenting side, ]with the ditch quickly filling up with the skewered and pierced bodies of so many of these ambitious people.