Van Rensburg and his brother Pieter were commandeered to participate in the second Anglo-Boer War under General Sarel P. du Toit. Van Rensburg however remained unarmed and never fired a shot. His contribution was to be a stream of visions and prophesies for the duration of the war. As the seer would later explain, he believed that a nightly visitor woke him only a day before the outbreak of the war, with a message that his work was dedicated to God.