The City of London gang war is the street fight that decides the borough once you have weakened Bloody Nora's Blighters. Accept the challenge from the messenger, beat her gang and then Nora herself to make the City Rook territory.
If you assassinated Nora before the war, the messenger says your odds have improved but warns you to keep an eye on her Blighters anyway.
Nora is killed in the brawl and the twins tell the surviving Blighters they work for the Fryes now. The City of London passes to the Rooks.
The City's Blighter control has to be worn down first. The borough's list covers Templar hunts on Thomas Blackroot, Eveline Dipper and the Slaughterhouse Siblings, bounties on Harvey Hughes, Maude Foster and David O'Donnell, strongholds at Field Lane, Black Swan Yard and Rosemary Lane, and the Spindles and Looms, Wolfshead Brewing Co. and Outteridge Manufacturing factories.
Bloody Nora is one of the seven Templar gang leaders who run London's boroughs for Crawford Starrick. Her name comes from an English exclamation of surprise or annoyance, and she appeared in the game's pre-alpha demo in May 2015.
The City of London is the financial heart of the map, a district of tall buildings and stone walkways where powerful people do business.
Gang War: Lambeth
The Lambeth gang war is your showdown with Cletus Strain's Blighters for control of the borough. The messenger warns that Strain is a bit sadistic; defeat his gang and then Strain to take Lambeth.
Gang War: Southwark
The Southwark gang war pits the Rooks against Octavia Plumb's Blighters, who accept the challenge only reluctantly. Win the brawl and defeat Plumb to claim Southwark.
Gang War: The Strand
The Strand gang war is the decisive fight against Victor Lynch's Blighters. Lynch agrees to the terms on condition that he fights with electrochemical bombs, so expect explosives once he joins.
Gang War: The Thames
The Thames gang war is the fight for ownership of the river borough against Edith Swinebourne's Blighters. Win the brawl and defeat Swinebourne to put the Thames under the Rooks.