The 1970s operation in Balochistan was a five-year military conflict in Balochistan, the largest province of Pakistan, between the Pakistan Army and Baloch separatists and tribesmen that lasted from 1973 to 1978. Fighting was intermittent throughout the conflict, climaxing in 1974 with drawn-out battles. The Bhutto regime was overthrown by General Zia-ul-Haq on 5 July 1977, and martial law was imposed. A general amnesty was declared by military governor Rahimuddin Khan. Army action ended by 1978, replaced by development and educational policies to conciliate the province.