https://www.bbc.co.uk/programmes/m0011l0r

BBC Radio 4 Drama Mosley Must Fall Monday 15 Nov 2021
"It's 1936, and as political unrest sweeps across Europe, the spectre of fascism is looming over the East End. One Irish family, living in Whitechapel, finds itself divided as Oswald Mosley and his fascist followers prepare to march through the heart of East London. When the march descends on Cable Street, an area highly populated by the Jewish and Irish working class, loyalties are tested as two brothers fight to make their mark in a historic battle."

As I understand it, the battle was between the residents who had blocked the route of the march and the police attempting to clear it.

http://www.cablestreet.uk/ The Jewish community of East London and its allies blocked the streets in order to prevent Oswald Mosley and his British Union of Fascists marching through. The Fascists were subjected to a humiliating defeat as the police found themselves unable to clear a path.

https://lookup.london/cable-street-mural/ Local activist Phil Piratin recalls that “It was along Cable Street that from the roofs and the upper floors, people, ordinary housewives, and elderly women too, were throwing down milk bottles and other weapons and all kinds of refuse that they didn’t any longer want in the house onto the police.” By late afternoon Sir Philip Game, the Commissioner of Police, instructed Moseley that he must turn back towards the West End and disperse his crowds. It was a victory for the East End.