rich Al Jazirah. Although he failed to restore this region's commercial wellbeing, the Khalifa organized workshops to manufacture ammunition and to maintain river steamboats. Regional relations remained tense throughout much of the Mahdiyah period, largely because of the Khalifa's commitment to using jihad to extend his version of Islam throughout the world. For example, the Khalifa rejected an offer of an alliance against the Europeans by Emperor Yohannes IV of Ethiopia (reigned 1871–1889). In 1887, a 60,000-man Ansar army invaded Ethiopia, penetrated as far as Gondar, and captured prisoners and booty. The Khalifa then refused to conclude peace with Ethiopia. In March 1889, an Ethiopian force, commanded by the emperor, marched on Metemma; however, after Yohannes fell in the ensuing Battle of Gallabat, the Ethiopians withdrew. Overall, the war with Ethiopia mostly wasted the Mahdists' resources. Abd ar Rahman an Nujumi, the Khalifa's best general, invaded Egypt in 1889, but British-led Egyptian troops defeated the Ansar at Tushkah. The failure of the Egyptian invasion ended the myth of the Ansars' invincibility. The Belgians prevented the Mahdi's men from conquering Equatoria, and in 1893, the Italians repulsed an Ansar attack at Akordat (in Eritrea) and forced the Ansar to withdraw from Ethiopia. As the Mahdist government became more stable and well-organized, it began to implement taxes and implement its policies throughout its territories. This negatively impacted its popularity in much of Sudan, as many locals had joined the Mahdists to gain autonomy while removing a centralist and oppressive government. In Darfur, rebellions against Abdallahi ibn Muhammad's rule broke out because he was ordering Darfurians to migrate north to better defend the Mahdist State, while favoring the Baggara over other Darfurian ethnicities in regards to government positions. The main resistance was led by religious leader Abu Jimeiza of the Tama tribe in western Darfur. The opposition to the Mahdist government was also fuelled by many Mahdists behaving arrogantly and abusive towards the locals. Several states bordering the Mahdist State to the west began to provide the Darfurian rebels with troops and other support. Faced with a growing number of rebels, the Mahdist rule in Darfur gradually collapsed. The Mahdist era became known as the umkowakia in Darfur — the "period of chaos and anarchy". Anglo-Egyptian reconquest of Sudan In 1892, Herbert Kitchener (later Lord Kitchener) became sirdar, or commander, of the Egyptian army and started preparations for the reconquest of Sudan. The