Rise of power in Semien Wube served as the governor of
Welkait on behalf of his father,
Dejazmach Haile Maryam. Before Haile Maryam death he chose his third son, Wube’s half-Brother
Merso, to succeeded him as the governor of semien. However, due to the fact that Merso mother was of
Yejju origin, Semien military officers choose Wube as the new governor since his mother was native of Semien. After Wube's usurpation, his two half brothers and Hirut Gugsa; their mother, fled to
Tigray province to their sister Yewub-dar, wife of
Sabagadis Woldu. Later that year, Maru of
Dembiya rebelled against
Ras Yimam and sided with his rival;
Dejazmach Goshu of Gojjam and Damot.
Ras Yimam turned to Wube for military backing, which he honored. In October 1827, the combined armies of Yimam and Wube met the combined armies of Goshu and Maru at Kosso Ber in
Gojjam and defeated them. Goshu escaped to his mountain fortress but Maru of Dembiya was killed and most of his territories given to Yimam's brother,
Dejazmach Marye Gugsa. Half of Wogera was restored back under Wube's control by the
Ras, as a reward for his service.
Conquest of Tigray and Eritrea In February 1831, Wube and
Ras Marye responded with a vigorous military campaign into Tigray. Marye and Wube's coalition met the forces of Sabagadis near the Tekeze river and conflict ensued.
Ras Marye perished, but Sabagadis lost (the
Battle of Debre Abbay) and was executed by
Ras Marye's followers the following day. Wube and his troops remained in Tigray.
Rebellions Kassai Sabagadis; the governor of
Agame and son of late Sabagadis Woldu, rose several times in rebellion against Wube in 1838. Kassai escaped Wube's wrath early that year when the warlord stopped pursuing the fleeing rebel over the Tembien mountains. In the second half of 1838, Wube left Tigray with his main army and crossed the Tekeze into Semien in anticipation of an attack by the regent
Ras Ali II on his dominion. In the absence of Wube; Kassai Sabagadis once again raised the standard of revolt, and this time took control of nearly all of Tigray. Wube recrossed the Tekeze and ended Kassai's rebellion. Kassai Sabagadis was put in chains and remained Wube's prisoner for over 15 years until
Tewodros II freed him. Another son of Sabagadis,
Dejazmach Gwangul Sabagadis from Agame was defeated by Wube in the second half of 1841 following his rebellion, Gwangul escaped with his life by fleeing into the salt plain deserts of Taltals. His status is underpinned by his being exempted from the usual requirement of
vassals to attend the
court of
Ras Ali II,
regent to the
Emperor of Ethiopia. In 1841, That same year, Wube defeated
Ras Ali II in battle, taking
Gondar, the then capital of Ethiopia. Nonetheless,
Ras Ali II escaped. In February 1842, their armies clashed again in the
Battle of Debre Tabor, where Wube's initial tactical superiority from imported firearms almost carried the day, until a detachment under
Dejazmach Birru Aligaz,
Ras Ali's uncle, went to pay homage with his forces to Wube's encampment but found him very intoxicated, also without guards and took him prisoner, thus enabling Ali to retain his title. Although Ras Ali II and Wube continued to have some tension, they avoided any serious clash as there was constant threat from Egyptian rulers from the north. == Defeat and death==