155 mm Creusot Long Tom part of the war the time fuses did not work properly. Case shot was used as a last resort when the enemy's foot soldiers were close to the gun. Case shot was effective up to 400 metres. During the Second Boer War the guns were deployed as field guns and siege guns at Vaal Krantz, Ladysmith, Mafeking, Kimberley and Bergendal. During the early stages of the war these guns gave the Boers an advantage as they had longer range than any British guns that were deployed in South Africa at the time. After all their ammunition had been expended, the
Siege of Mafeking siege remained and shelling of Mafeking continued. Aware of the approaching British relief columns, the Boers launched a final major attack early in the morning of 12 May that succeeded in breaching the perimeter defences and setting fire to some of the town, but were finally beaten back. On 12 May, at about 4 a.m., Field Cornet S. Eloff led a force of 240 Boers in a daring assault on Mafeking. Covered by a feint attack on the east side of the town, the attackers slipped between the Hidden Hollow and Limestone forts on the western face of the defences.