The First Italo–Ethiopian War was fought between Italy and Ethiopia in 1895-1896. Ethiopia's military victory over Italy secured it the distinction of being the only African nation to resist European colonialism with a decisive show of force.
In fact, the bilingual Treaty of Wuchale did not say the same thing in Italian and Amharic. The former text established an Italian protectorate over Ethiopia, which Menelik discovered soon afterwards. The Amharic version, however, merely stated that Menelik could contact foreign powers and conduct foreign affairs through Italy if he so chose. Italian diplomats, however, claimed that the original Amharic text included the clause and Menelik knowingly signed a modified copy of the Treaty.
Yet despite the Ethiopian refusal to honor this treaty and economic handicaps of their own, the Italian government decided on a military solution to force Ethiopia to abide by their version of this treaty. In doing so, they believed that they could exploit divisions within Ethiopia as well as rely on tactical and technological superiority to offset any superiority in numbers.
In December 1894, Bahta Hagos led a rebellion against the Italians in Akkele Guzay, claiming support of Mengesha. Units of General Oreste Baratieri's army under Major Pietro Toselli crushed the rebellion and killed Hagos. The Italian army then occupied the Tigrian capital, Adwa. Baratieri suspected that Mengesha would invade Eritrea, and met him at the Battle of Coatit in January 1895. The victorious Italians chased a retreating Mengesha, capturing weapons and important documents proving his complicity with Menelik. The victory in this campaign, along with previous victories against the Sudanese Mahdists, led the Italians to underestimate the difficulties to overcome in a campaign against Menelik. At this point, Emperor Menelik turned to France, offering a treaty of alliance; the French response was to abandon the Emperor to secure Italian approval of the Treaty of Bardo which would secure French control of Tunisia. Virtually alone, on 17 September 1895, Emperor Menelik issued a proclamation calling up the men of Shewa to join his army at Were Ilu.
The next clash came at Amba Alagi on 7 December1895, when Ethiopian soldiers overran the Italian positions dug in on that natural fortress, and forced the Italians to retreat back to Eritrea. The remaining Italian troops under General Giuseppe Arimondi reached the unfinished Italian fort at Meqele. Arimondi left there a small garrison of approximately 1150 askaris and 200 Italians, commanded by Major Giuseppe Galliano, and took the bulk of his troops to Adigrat, where Oreste Baratieri, the Italian commander, was concentrating the Italian Army.
The first Ethiopian troops reached Maqele in the following days. Ras Makonnen surrounded the fort at Meqele on December 18, but the Italian commander adroitly used promises of a negotiated surrender to prevent the Ras from attacking the fort. By the first days of January, Emperor Menelik, accompanied by his Queen Taytu Betul, had led large forces into Tigray, and besieged the Italians for 15 days (January 6 - January 21 1896), trying in vain to storm the fort on several occasions, until the Italians surrendered with permission from the Italian Headquarters. Menelik allowed them to leave Meqele with their weapons, and even provided the defeated Italians mules and pack animals to rejoin Baratieri. While some historians read this generous act as a sign that Emperor Menelik still hoped for a peaceful resolution to the war, Harold Marcus points out that this escort allowed him a tactical advantage: "Menelik craftily managed to establish himself in Hawzien, at Gendepata, near Adwa, where the mountain passes were not guarded by Italian fortifications.
Heavily outnumbered, Baratieri refused to engage, knowing that the Ethiopians could not keep large numbers of troops in the field much longer. However, the Italian government of Francesco Crispi was unable to accept being stymied by non-Europeans. The prime minister specifically ordered Baratieri to bring about a battle.
General Baratieri planned to surprise the larger Ethiopian force with an early morning attack, expecting that his enemy would be asleep. However, the Ethiopians had risen early for Church services, and upon learning of the Italian advance, swept forth to meet it, and crushed the Italians. While Menelik's victory was in a large part due to sheer force of numbers, Menelik's careful preparations had made them well-armed numbers.
Italian dead and missing numbered about 7000 with a further 3,000 captured. In addition, 2,000 Eritrean askaris were killed or captured. The Ethiopians had lost about 3,000 dead and 6,000 wounded. Italian prisoners were treated as well as possible under difficult circumstances, but 800 captured askaris, regarded as traitors by the Ethiopians, had their right hands and left feet amputated.
Menelik secured the Treaty of Addis Ababa in October, which strictly delineated the borders of Eritrea and forced Italy to recognize the independence of Ethiopia. Delegations from the United Kingdom and France -- European powers whose colonial possessions lay next to Ethiopia -- soon arrived in the Ethiopian capital to negotiate their own treaties with this newly proven power.