Theron's most notable single action was at the Battle of Paardeberg where, on 25 February 1900, Gen. Piet Cronje and several thousand troops were surrounded by British forces.

After the British occupied parts of the Orange Free State in March 1900, Theron and the TVK became well-known for the guerrilla campaign they conducted against the Imperial forces.

While scouting alone on a koppie at Gatsrand, about 6 kilometres (3.7 mi) north of present-day Fochville, he encountered seven members of Marshall's Horse and was killed in action.

According to the source, Daniel almost ran into the cavalry platoon, but he reacted and opened fire so swiftly that he nearly eliminated the entire squad of seven, killing three and maiming four.

[2][8] General de Wet remarked "Men as lovable or as valiant there might be, but where shall I find a man who combined so many virtues and good qualities in one person?

On 10 March 1903, Theron's last will was carried out and his body was once again exhumed to be reburied next to that of his late fiancée Hannie Neethling on her father's farm Eikenhof on the Klip (Rock) River.

[2] On 28 December 1907, Generals Louis Botha and Jan Smuts unveiled the Danie Theron Monument near Potchefstroom.

On 9 September 1950, a monument was unveiled at the location where Danie Theron died (near the N12 road between Johannesburg, South Africa and Potchefstroom).

On one of the very rare occasions where Mr. Mandela spoke Afrikaans in public, he said he valued the fighting spirit of Danie Theron, his honesty, bravery and his determination to do the right thing for his nation and his beliefs.

[2][10] One of the primary schools in Carletonville was named in honour of this Boer hero, i.e. Laer Gedenkskool Danie Theron.

A smaller replica of the monument (found on the hill near Fochville) was also erected on the school grounds, near the main entrance.