Despite his earlier victory at El Teb, Graham realised that Osman Digna's force was far from broken and that he still enjoyed support among the local population. Accordingly, a second expedition departed from Suakin on 10 March in order to defeat the Mahdists definitively.
The force was composed of the same units that had fought at El Teb: 4,500 men, with 22 guns and 6 machine guns. The Mahdists had roughly 10,000 men, most of them belonging to Osman Digna's Hadendoa tribe (known to British soldiers as "Fuzzy Wuzzies" for their unique hair).
On the night of the 12th the British formed an encampment, not far from Osman Digna's positions. From around 1 o'clock until dawn, Mahdist riflemen approached the camp and opened fire, but their shooting was imprecise, and they inflicted few casualties.
At dawn, the artillery was brought to bear against the Mahdist skirmishers and they were driven back. The infantry (which included the Black Watch) then formed into two infantry squares each of brigade-size and advanced. One square was commanded by Colonel Davis, with General Graham, and the other by Colonel Buller. A scouting party discovered that the main body of the Mahdist force was hidden in a nearby ravine, whereupon General Graham ordered the 42nd Black Watch to charge, leaving a wide gap where they had been stationed in one of the squares. A sudden onslaught of Mahdists rushed into this gap.
At one point, one Black Watch defensive square found themselves under intense attack from the Sudanese. The square broke and was flooded with a rush of tribesman and resulted in a brutal hand-to-hand fight. The Scots nearly fled, but were mustered by able non-commissioned officers to stand and fight and eventually won the contest, driving the Sudanese out, and reforming their square. It is one of the most embarrassing events for the Black Watch, even to this day. Even now, if Welsh soldiers yell out "Broken Square" at a Scotsman, particularly associated with the Watch, a fight ensues.
Finding themselves in danger of being cut off, the British units fell back in disarray but was quickly reformed in good order. The Mahdist advance was halted by volleys from the other (Buller's) square, which had survived the attack, and by dismounted cavalry units that had not been engaged until then. The concentrated flanking fire they inflicted caused huge casualties among the Mahdists, who were forced to retreat.
The British units then reformed, and resumed their advance, driving the shaken Mahdists out of the ravine and inflicting more casualties on them as they fled. Osman Digna's camp was captured later that day, but Osman Digna escaped.
During this battle, the British suffered more losses than in any other battle of the Mahdist war, 214 soldiers being wounded or killed, ten of which were officers. The Mahdists also suffered heavily, losing 4,000 men.
For their conspicuous bravery during the battle, Private Thomas Edwards of the Black Watch and Lieutenant Percival Marling of the KRRC were awarded the Victoria Cross, the highest decoration in the British Army.
The British hoped that this defeat would deal a great blow to Osman Digna's prestige as well as weakening his forces, and that he would lose his hold over the Hadendoa. However this was not the case, and when later that year, Graham's force was withdrawn from the Sudan, he gradually recovered his influence. Therefore Graham’s campaign came to be seen purely as a punitive exercise against the Sudanese to restore British military pride.
Winston Churchill, who later participated in the Mahdist war, was critical of the British Government's atittude in Eastern Sudan:
It has been suggested that the objective of British operations in that sector was to avert a possible peril to navigation in the Red Sea. If the Mahdists had taken control of the whole of the Sudanese coast, they might have threatened ships travelling to India, thus endangering the British Empire.
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