Amadeo could count on the support of only the progressive party, whose leaders were trading off in the government thanks to parliamentary majority and electoral fraud. The progressives divided into monarchists and constitutionalists, which made the instability worse, and in 1872 a violent outburst of interparty conflicts hit a peak. There was a Carlist uprising in the Basque and Catalan regions, and after that, republican uprisings happened in cities across the country. The artillery corps of the army went on strike, and the government instructed the King to discipline them.