The city's jail was built in 1851, and the Municipality of Hyderabad was established in 1853. In the Pacco Qillo the British kept the arsenal of the province, transferred from Karachi in 1861, and the palaces of the ex-Amirs of Sind that they had taken over. In 1857, when the Indian mutiny raged across the South Asia, the British held most of their regiments and ammunition in this city. Though the city did not witness major fighting, the British demolished the large round tower that once stood outside of Pacco Qillo, deeming it a potential risk to their rule were it to fall into the hands of rebels.