17 February 1982
Joshua Nkomo, long time friend of Robert Mugabe, was dismissed as minister of the interior on the accusation of plotting a coup in Zimbabwe. This triggered bitter fighting between Zimbabwe African People's Union (ZAPU) supporters in the Ndebele-speaking region of the country and the ruling Zimbabwe African National Union (ZANU). Between 1982 and 1985 the military brutally crushed armed resistance in Ndebeleland and Mugabe's rule was left secure. At least 20 000 died in the ensuing massacres.
References

News24, Key Dates in Zim's post-independence history, from News24, [online], Available at www.news24.com [Accessed: 21 January 2014]|sirnige.com, Key Dates in Zim's post-independence history, from Sir Nigel's Journey..., [online], Available at sirnige.com [Accesed: 21 January 2014]|BBC, (1999), Obituary: Joshua Nkomo, from BBC News, 01 July, [online], Available at news.bbc.co.uk [Accessed: 21 January 2014]