On September 26, 1914, Colonel Grant and a small force of African Rifles and Transvaal Horse Artillery operating at Sandfontein near the German border were trapped by two German battalions while on their way to a water hole. From the heights the German guns swept the circular basin below where the Union force was gathered. The advantage was all in favor of the Germans. High explosive shells from ten guns wrought havoc among the South African soldiers, but not until their ammunition ran out and every man of their gun crews was either killed or wounded would the little band of Boers and Britons surrender. It developed later that Lieutenant Colonel S. G. Maritz, a Boer leader commanding Union forces in the Northwest territory, had turned traitor and arranged the disaster. It was through General Beyers that he had been appointed to an important command on the German border. Maritz who was now ordered by General Smuts, Minister of Defense, to report to headquarters and give up his command, sent a defiant reply October 8, 1914. He stated that in addition to his own troops he had German guns and men, and had signed an agreement with the Governor of Southwest Africa ceding Walfish Bay (a British possession) and certain portions of Union territory in return for a guarantee of the independence of the South African Republic. All his officers and men who were unwilling to join with him had been sent as prisoners into German territory. General Botha replied to the rebel by proclaiming martial law throughout the Union. General Brits, with the imperial Light Horse, was sent to capture Maritz, and in an engagement October 15, 1914, at Ratedraai, near Upington, took seventy rebel prisoners. On October 22, 1914, Maritz with 1,000 rebels and seventy German gunners, attacked at dawn the post of Keimos, where there were only 150 loyalists. The little garrison held out until reenforcements arrived and the battle then turned against Maritz, who offered to surrender for a free pardon. This being refused, the fight went on, and Maritz eventually fled wounded into German territory. Two days later a party of rebels with German gunners were defeated at Kakamas. General Hertzog, who had represented the pro-German party in the Union Parliament, gathered a commando and broke out in revolt on October 21, 1914. He issued a manifesto complaining of English oppression, and announced that he would tolerate it no longer. Three members of the Union Parliament and a member of the Defense Council, Mr. Wessel-Wessels, came out in arms. In the western Transvaal and the northern Free State the rebel leaders had about 10,000 men in separate groups. Their plan was to join their commandos with a force under Maritz from German Southwest Africa.