This battery was equipped from the funds collected by the Lord Mayor in December 1899, and was mainly officered and manned from the Honourable Artillery Company. The battery was commanded by Major G McMicking. The horses, which did admirably, were purchased by him from the London Omnibus Companies. The battery was furnished with four 12½ pounder quick-firing guns, manufactured by Messrs Vickers' Sons & Maxim. The time-shells were fitted with Krupp fuses, and the guns burst shrapnel at longer range than the ordinary field-guns. The battery arrived at the Cape about 27th February 1900. Most of their campaigning was done under Major General Paget, at first in the north of the Orange River Colony, and afterwards north of Pretoria.
The battery was for a time at Bloemfontein, and got up to Kroonstad on 21st June. On 23rd June it joined a force which was to escort a convoy to Lindley. The convoy was fiercely attacked on the 26th and 27th, but the enemy was driven off (see 1st King's Own, Yorkshire Light Infantry). On 3rd July, Paget's brigade, to which the battery was now attached, was stoutly opposed between Lindley and Bethlehem. One section was with the general on the right, and was praised by him for very good work. One section, with two sections of the 38th Battery RFA, was near the left. A ridge had been occupied, and these six guns placed on it. By an indiscreet order the troops on the right and left of these guns were retired behind the ridge. The enemy crept up unobserved, and pouring in a deadly rifle-fire they gained possession of three of the guns of the 38th Battery. Captain Budworth, of the CIV Battery, galloped for some Australians who had been retired. They boldly came back and drove off the enemy, and the three guns were recovered. On the 6th and 7th July there was again heavy fighting outside Bethlehem. In his despatch of 10th October 1900, para 8, Lord Roberts, dealing with the capture of Bethlehem, said, "The good service of the 38th Battery RFA and the City Imperial Volunteers' Battery has also been brought to notice by Major General Paget". Paget's force was ordered north after the surrender of Prinsloo, and did much excellent work north-west and north-east of Pretoria. The battery was with Paget when he made a forced night-march and captured the camp of Erasmus (see 1st West Riding Regiment). The battery sailed for home in October 1900. In Lord Roberts' despatch of 4th September 1901 6 officers and 6 non-commissioned officers and men were mentioned.