16 December 1838 The Battle of Blood River when the Voortrekkers defeated the Zulu impis in South Africa.
Battle of Blood River, article from Wikipedia https://en.wikipedia.org/wiki/Battle_of_Blood_River#:~:text=The%20Battle%20of%20Blood%20River,in%20their%20Republic%20of%20Natal

DIE GELOFTE    Various recordings on YouTube       https://www.youtube.com/results?search_query=%22Die+Gelofte%22
THE BLOOD RIVER MIRICAL  - John Edmond       https://www.youtube.com/watch?v=pn69XRblHQs