The conclusion of the American Civil War allowed many American soldiers claiming Irish heritage to travel to Ireland to support a planned uprising in 1865
The original uprising was postponed because the IRB only had 6,000 weapons for the 50,000 people willing to fight. In 1867 a rising was staged after James Stephens was arrested and forced to leave the country
Without the organisation of Stephens, the 1867 uprising was poorly coordinated. The leaders of the IRB did not employ guerilla tactics and instead preferred to fight in an open engagement despite their little strength, meaning they were quickly defeated
After the uprising failed, 2 IRB leaders, ThomasKelly and TimothyDeasy, travelled to Britain to revive the movement there. They were transferred to prison and eventually rescued by the IRB in an incident where a policeman was killed
Many Irishmen in Manchester were targetted, with 5 being charged and put on trial, including WilliamAllen, MichaelLarkin and MichaelO'Brien. They were executed in front of a crowd of more than 8,000, with 2,500 police officers on duty
By taking such a hard line, the government was sending out a warning to anyone opposing them in the future, The executions only created martyrs to the Irish cause who developed a harder attitude towards Britain