'After the siege'. The Sidney Street Siege (popularly known as the Battle of Stepney) in East London. The siege took place when it was discovered that a gang of Latvian anarchists responsible for the deaths of three policemen during an attempted robbery were living at 100 Sidney Street. The street was cordoned off and the two sides fired at each other for some time. The siege ended with a fire inside the house, and the deaths of two of the gang. The involvement of the Guards was authorised by the Home Secretary, Winston Churchill, and caused some controversy.