Lord Roberts captured Pretoria on 5 June and the armies soon passed to the east. After the guerrilla war began, a force under Clements harried the Boers in the Moot, a valley in the Magaliesberg mountains. By the end of the year, the British grew careless. On 2 December, De la Rey's commando ambushed an ox-wagon convoy east of Rustenburg, killing and wounding 64 British soldiers and capturing 54 men and 118 wagons. De la Rey's deputy, Jan Smuts had a close call when a bullet intended for him killed another Boer. The raiders appropriated the boots and clothing and burned the rest of the supplies, while setting their prisoners free.