Afrikaan song

I think the name of it is 'Sarie Marais'. It's an old Afrikaanse song from the Boer War period. Hope this helps.

The tune - Sarie Marais - is also used as a regimental quick march by Britain's Corps of Royal Marines, specifically the RM Commandos. This is because the tune first came to the attention of the British during the Boer War when British forces were engaged by Boer commando units.