1 April 1913
In 1913 the Police Bill and Defence Bill were both enacted and the authorisation for the establishment of a national police force was given. The South African Police (SAP) was the successor to the police forces of the Cape Colony, the Natal Colony, the Orange River Colony and the Transvaal Colony. The entire force had to be restructured and for a short period the South African Defence Force's (SADF) military police assisted the SAP where necessary.  Not very long after the establishment of the SAP, mineworkers’ strike and Indian Passive Resistance campaign erupted on the Witwatersrand and in Natal (kwaZulu Natal). The police force was still being restructured and when negotiations broke down, around 19 000 miners took part in mass action that turned violent on 5 July 1913 as it gained momentum. The SAP could not handle the situation alone and the military was called in.
References

South African History Online‘South African Police Services (SAPS)’, [online], Available at www.sahistory.org.za [Accessed: 31 March 2014]|Icon‘Gallantry Awards Of The South African Police

1913 to 1994’, [online], Available at  www.icon.co.za [Accessed: 31 March 2014]|History Flags of Our Ancestors‘Military Flags of South Africa’, [online], Available at www.loeser.us [Accessed: 31 March 2014]