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Italo-Ethiopian War

Menelik's disagreement with Article 17 of the treaty led to the Battle of Adwa. Before Italy could launch the invasion, Eritreans rebelled in an attempt to push Italy out of Eritrea and prevent its invasion of Ethiopia. The rebellion was not successful. However, some of the Eritreans managed to make their way to the Ethiopian camp and jointly fought Italy at the Battle of Adwa.

On 17 September 1895, Menelik ordered all of the Ethiopian nobility to call out their banners and raise their feudal hosts, stating: "An enemy has come across the sea. He has broken through our frontiers to destroy our fatherland and our faith. I allowed him to seize my possessions and I entered upon lengthy negotiations with him in hopes of obtaining justice without bloodshed. But the enemy refuses to listen. He undermines our territories and our people like a mole. Enough! With the help of God, I will defend the inheritance of my forefathers and drive back the invader by force of arms. Let every man who has sufficient strength accompany me. And he who has not, let him pray for us". Menelik's opponent, General Oreste Baratieri, underestimated the size of the Ethiopian force, predicting that Menelik could only field 30,000 men.

Despite the dismissive Italian claim that Ethiopia was a "barbaric" African nation whose men were no match for white troops, the Ethiopians were better armed, being equipped with thousands of modern rifles and Hotchkiss artillery guns together with ammunition and shells which were superior to the Italian rifles and artillery. Menelik had ensured that his infantry and artillerymen were properly trained in their use, giving the Ethiopians a crucial advantage as the Hotchkiss artillery could fire more rapidly than the Italian artillery. In 1887 a British diplomat, Gerald Portal, wrote after seeing the Ethiopian feudal hosts parade before him, the Ethiopians were "...redeemed by the possession of unbounded courage, by a disregard of death, and by a national pride, which leads them to look down on every human being who has not had the good fortune to be born an Abyssinian ".

The Emperor personally led his army to attack an Italian force led by Major Toselli on 7 December 1895 at Boota Hill. The Ethiopians attacked a force of 350 Eritrean irregulars on the left flank, who collapsed under the Ethiopian assault, causing Toselli to send two companies of Italian infantry who halted the Ethiopian advance. Just as Toselli was rejoicing in his apparent victory, the main Ethiopian assault came down on his right flank, causing Toselli to order a retreat. The Emperor's best general, Ras Makonnen, had occupied the road leading back to Eritrea, and launched a surprise attack, which routed the Italians. The battle of Amba Alagi ended with an Italian force of 2,150 men losing 1,000 men and 20 officers killed.

Ras Makonnen followed up that victory by defeating General Arimondi and forcing the Italians to retreat to the fort at Mekele. Ras Makonnen laid siege to the fort, and on the morning of 7 January 1896, the defenders of the fort spotted a huge red tent among the besiegers, showing that the emperor had arrived. On 8 January 1896, the emperor's elite Shoan infantry captured the fort's well, and then beat off desperate Italian attempts to retake the well. On 19 January 1896, the fort's commander, Major Galliano, whose men were dying of dehydration, raised the white flag of surrender. Major Galliano and his men were allowed to march out, surrender their arms, and go free. Menelik stated he allowed the Italians to go free "to give proof of my Christian faith," saying his quarrel was with the Italian government of Prime Minister Francesco Crispi that was trying to conquer his nation, not the ordinary Italian soldiers who been conscripted against their will to fight in the war. Menelik's magnanimity to the defenders of Fort Mekele may have been an act of psychological warfare. Menelik knew from talking to French and Russian diplomats that the war and Crispi himself were unpopular in Italy, and one of the main points of Crispi's propaganda was allegations of atrocities against Italian POWs. From Menelik's viewpoint allowing the Italian POWs to go free and unharmed was the best way of rebutting this propaganda and undermining public support for Crispi.

Crispi sent another 15,000 men to the Horn of Africa and ordered the main Italian commander, General Oreste Baratieri, to finish off the "barbarians". As Baratieri dithered, Menelik was forced to pull back on 17 February 1896 as his huge host was running out of food. After Crispi sent an insulting telegram accusing Baratieri of cowardice, on 28 February 1896 the Italians decided to seek battle with Menelik. On 1 March 1896, the two armies met at Adwa. The Ethiopians came out victorious.

With victory at the Battle of Adwa and the Italian colonial army destroyed, Eritrea was Emperor Menelik's for the taking but no order to occupy was given. It seems that Emperor Menelik II was wiser than the Europeans had given him credit for. Realising that the Italians would bring all their force to bear on his country if he attacked, he instead sought to restore the peace that had been broken by the Italians and their treaty manipulation seven years before. In signing the treaty, Menelik II again proved his adeptness at politics as he promised each nation something for what they gave and made sure each would benefit his country and not another nation. Subsequently, the Treaty of Addis Ababa was reached between the two nations. Italy was forced to recognise the absolute independence of Ethiopia, as described in Article III of the treaty.