1988
The USC, a Hawiye organization founded in 1987, had suffered from factionalism based on subclan rivalries since its creation. General Mahammad Faarah Aidid commanded the Habar Gidir clan, and Ali Mahdi Mahammad headed the Abgaal clan. The SPM emerged in March 1989, after a group of Ogaden officers, led by Umar Jess, deserted the SNA and took up arms against Siad Barre. Like the USC, the SPM experienced a division among its ranks. The moderates, under Jess, favored an alliance with the SNM and USC and believed that Somalia should abandon its claims to the Ogaden. SPM hardliners wanted to recapture the Ogaden and favored a stronger military presence along the Somali-Ethiopian border.
On November 19, 1989, the SNM and SPM issued a joint communique announcing the adoption of a "unified stance on internal and external political policy." On September 12, 1990, the SNM concluded a similar agreement with the USC. Then, on November 24, 1990, the SNM announced that it had united with the SPM and the USC to pursue a common military strategy against the SNA. Actually, the SNM had concluded the unification agreement with Aidid, which widened the rift between the two USC factions. By the beginning of 1991, all three of the major rebel organizations had made significant military progress. The SNM had all but taken control of northern Somalia by capturing the towns of Hargeysa, Berbera, Burao, and Erigavo. On January 26, 1991, the USC stormed the presidential palace in Mogadishu, thereby establishing its control over the capital. On May 20, 1988, SNM movement launched a massive attack on Hargeysa, the capital of Somaliland Present. After two years, SNM took control of major cities in Somalilnad, and Siad Bareh Regim Army begin to surrender to SNM movement.
Read more about this topic: Somali National Movement