On 20 January, Badoglio launched the first battle of the Tembien. On the left of the Eritrean Corps, the
2nd Eritrean Division advanced in two columns through the area around
Ab'aro Pass. On the right of the Eritrean Corps, the
2nd CC.NN. Division "28 Ottobre" advanced towards the torrent that was the Beles River. The Italian III Corps held Nebri and Negada. Badoglio attacked in Tembien: from the Abarò pass, on the left, some battalions of Vaccarisi's 2nd Eritrean Division detached themselves and, divided into two columns under the command of General
Renzo Dalmazzo and Colonel
Ruggero Tracchia, had as their objective the occupation of the region between
Melfa and Quarar; a smaller column in the centre was directed towards Abba Salamà, while on the right a sortie from the Uarieu pass towards the Beles valley was planned to engage the Abyssinian troops. This column however, according to the orders that Badoglio gave to
Alessandro Pirzio Biroli, was to carry out a simply demonstrative action without detaching itself too far from the pass and without running the risk of being attacked. General Filippo Diamanti then led a column of roughly 1,500 soldiers to the Daran area, where the Ethiopians managed to attack the heavily outnumbered Italians. General Diamanti's men, surrounded by forces 10 times superior, began the retreat towards the pass leaving on the field more than 260 dead among which also included Father
Reginaldo Giuliani, who would become a martyr of Fascism. The XII Indigenous Battalion intervened to save the survivors and retreat again to Passo Uarieu defended by the forces of the 2nd CC.NN. Division "28 ottobre" of General
Umberto Somma. By the end of the day, the 2nd Eritrean Division fell back to positions around
Ab'aro Pass and the 2nd CC.NN. Division on the Italian right was surrounded and besieged at the Worsege Pass. For three days the Ethiopians, who had a substantial numerical superiority, besieged the Italians at Worsege Pass, who were low on water and ammunition. By the afternoon of 22 January, the CC.NN. division and the garrison at Worsege Pass were still cut off and low on water and ammunition, the fury of the Ethiopian attacks was reaching a crescendo, and Badoglio drew up plans for a withdrawal to new defensive lines. There is no way to know what the result would have been if he had attempted to withdraw 70,000 men, 14,000 animals, and 300 guns of the Italian I Corps and III Corps down the single road from Makale with the forces of
Ras Mulugeta at their rear. However the Italian troops at the Worsege pass stubbornly repulsed every Ethiopian attack and on the third day, the
Italian Royal Air Force (
Regia Aeronautica Italiana) saved the day for Badoglio. The Ethiopians could no longer stand up to the deadly clouds of mustard gas rained down non-stop on the roads the troops took, the base camps where they gathered, and any area surrounding them. On the 24th, around midday, the relief columns of the 2nd Eritrean Division reached the positions held by the legionaries of the 28th October Legion, thus breaking the siege and finally supplying the besieged with water, food and ammunition. At the end of the battle the Italian dead were 60 officers, 605 CC.NN. and 417 Ascari. ==Aftermath==