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.
Lynch enters the brawl promising to blow the twins to smithereens and is killed, and The Strand falls to the Rooks.
Victor Lynch only puts the Strand on the line once its activities are done: the Templar hunts on Louis Blake, Argus and Rose Bartlett, and Peter Needham, the bounties on Sylvia Duke, Milton King and Gilbert Fowler, the Clare Market and St. Giles Rookery strongholds, and Lynch's Fine Ornamentation factory.
Born into a very rich family, Lynch lived on its money and spent his time experimenting with dangerous chemicals to stave off boredom. His disregard for the people around him made him feared across the Strand, and the bombs he brings to this war come from that work.
With explosives in play, avoid bunching up with your Rooks once he arrives, so a single bomb does not catch everyone at once.
Gang War: City of London
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.
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 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.