At the outbreak of the
Second Boer War (Anglo-Boer War) in October 1899 he was a
police officer at
Krugersdorp. In this war Celliers served as a general for the districts of
Lichtenburg and Marico. He became renowned for his methods of firing a gun while
galloping fast on a horse, as well as silencing British cannons. In early 1902 he surprised with less than 500 soldiers British Colonel
Stanley von Donop and his 1,000 troops who fled. In a meeting with Boer commanders on 29 May 1902 at
Vereeniging, Celliers' vote was with those who proposed to stop fighting. Subsequently, he was one of the signatories of the
Treaty of Vereeniging in
Pretoria concluding the war on 31 May 1902. == Literature ==