Oromo expansion

The Oromo expansions were a series of massive territorial movements during the 16th and 17th centuries.

Before these movements, the Oromo people lived primarily in what is now southern Ethiopia and northern Kenya. These expansions fundamentally reshaped the demographics and political boundaries of the Horn of Africa. The process was driven by several factors, including the intense wars between the Adal Sultanate and the Ethiopian Empire. As these two major powers weakened each other, the Oromo tribes moved into central and eastern Ethiopia. This era is documented in various Christian, Muslim, and Portuguese historical records.

One possible motivation is found in the legend of Liqimssa from the Borana sect. Liqimssa, which means "The Swallower," is described as a beast that consumes everything in its path. This legend represents a powerful force that leaves the land barren. Some historians, such as Mohammed Hassen, interpret this story as a reflection of the growing power of the Christian kingdom. This influence pressured the Oromo homelands from the north. The expansion eventually moved through distinct stages of military and social organization.

In the early stages, the Oromo conducted sporadic raids known as razzia. Under the leadership of the luba Melbah, the Oromo invaded the Bale region in the southeast. During the subsequent luba Mudena, they moved past the Wabi Shebelle River. These early groups were pastoralists who focused on capturing cattle and other booty. After these quick strikes, the raiding parties always returned to their original homes near the Shebelle River. They often targeted isolated communities while the larger Christian and Muslim kingdoms were distracted by their own wars.

By the 1530s, the Oromo developed a sophisticated three-stage method for expansion. This tactical process involved scouting, night-time surprise attacks, and finally, settlement. Scouting teams were used to learn the terrain and monitor borders. The night attacks were designed to be relentless, allowing warriors to seize goods and escape before dawn. Once a community was sufficiently weakened, the Oromo would settle the area. They used a tradition called Moggaasaa to integrate the remaining people into their society. This process allowed new members to regain their livelihoods while joining the Oromo fighting class.

Under the luba Bifolé between 1546 and 1554, the nature of the movement changed significantly. Previous movements had been minor, but Bifolé’s raids began to weaken Ethiopian control. The province of Dewaro was pillaged, and Fatagar was attacked for the first time. During this time, some inhabitants were taken as gebrs, which were tax-paying serfs. This period caused significant distress, forcing Emperor Gelawdewos to settle refugees in the town of Wej around 1550.

A fundamental shift occurred during the rule of the luba Meslé from 1554 to 1562. For the first time, the Oromo began to settle permanently in newly taken territories. They also adopted horseback riding, using both horses and mules. This new mobility greatly increased their fighting power, making them a match for Ethiopian troops who used firearms. The Oromo also expanded into the Adal Sultanate, defeating the forces of the Amir of Harar at the Battle of Hazalo. These successes allowed them to move even deeper into core provinces like Amhara, Angot, and Shewa.

The expansion had a profound impact on the Harar region and the Adal Sultanate.

As Oromo groups occupied areas as far as Hobat, the Adal Sultanate was forced to build defensive walls around its capital, Harar. Other towns, such as Gidaya and Dakkar, also built ramparts for protection. The combination of these invasions and droughts led to food shortages and epidemics in the Harar region. These hardships caused a massive loss of life, including the Adal leader Nur ibn Mujahid in 1567. Many local populations, such as the Harari and the Harla, were either assimilated or diminished by these events.

Despite these expansions, the Ethiopian Empire attempted several military responses. Emperor Sarsa Dengel led punitive expeditions in the 1570s to curb the Oromo spread. In 1573, he engaged Oromo forces near Lake Zway and captured a large number of cattle. He also fought a battle in the Mojjo Valley against the Borana Oromo. While these imperial campaigns sometimes pushed the Oromo back to frontier provinces like Fatagar, the Oromo continued to establish a permanent presence across the region. The movements ultimately created the complex social and ethnic map seen in the area today.