21 December 1915
2,800 South African miners embark on a strike at the Van Rhyn Deep mines in a bid to redress some of their grievances. Located at Vanrhynsdorp, the mines were discovered during the South African diamond rush of the 1870s.  
References

South African History Online, (2013), South Africa Timeline: 1910, from >South African History Online, 25 November, [online], available at www.sahistory.org.za [Accessed: 25 November 2013]