Breach in the Wall
From Witcher Wiki
The breach in the wall is the de facto west gate out of Old Vizima. It leads to the Swamp Cemetery and ultimately to the Old Manor. It is not easily attained. Geralt must fight his way there from the field hospital regardless of his choice of path. The only differences being the sort of opponents he meets along the way and the placement of the barricades in his path.
The Order Quartermaster, a merchant can be found there. He doesn't buy much, if anything, but he does sell and interesting variety of weapons.
