They had to rid Sleb Harbor of the remaining blackguards and their allies before leaving for Maynard Island, and that was what they focused on. Erik threw himself into every battle, driven by a hunger for experience points and power.
The Chimaeric Demons did the same, but starting from the second day, whenever Erik took charge of a sector, most of the Chimaeric Demons went to rest or to help their brothers elsewhere.
This way, Erik ensured not only that their fights got shorter but that they progressively had more time to rest.
The fighting was widespread, affecting every single area of the city, even outside the walls and under the city.
By reading the enemies' minds, Erik found out how the blackguards came into the city. The same way he did, from holes in the walls, connected to underground tunnels and facilities.