thumb|upright|General Redvers Henry Buller launched an offensive against the Boers in the early phases of the war but after several defeats, culminating at the Battle of Colenso, he was replaced by Lord Roberts.
thumb|upright|General Redve.rs Henry Buller launched an offensive against the Boers in the early phases of the war but after several defeats, culminating at the Battle of Colenso, he was replaced by Lord Roberts