Border violence and ethnic clashes On 8 April 1989, there was a clash between Senegalese Soninke farmers and Mauritanian Fulani herdsmen in Mauritania over grazing rights in
Diawara, a town in the
Bakel Department of eastern Senegal. This event marked the beginning of the conflict. The clash took place because the Senegalese herdsmen confiscated a herd of cattle belonging to the Mauritanian farmers after the cattle migrated into Senegalese territory. The confiscation of the cattle was in accordance with an earlier agreement made between Senegal and Mauritania over grazing rights and territorial control. Despite this, Mauritanian border guards intervened after spotting a group of Senegalese farmers who had crossed into Mauritanian controlled territory. The border guards fired at the group, killing at least two Senegalese peasants, as well as seriously injuring several more, and taking between 12 and 15 Senegalese farmers hostage. Official reports of the incident from Senegal and Mauritania provide conflicting details, as the Senegalese government claims the attackers were border guards, and the Mauritanian government claims the attackers were Mauritanian farmers. As a result of the 8 April attack and the subsequent comments by Abdallahi, Senegalese citizens on the southern bank
rioted, escalating the conflict. Between 21–24 April 1989, Senegalese mobs looted and burned shops owned by Mauritanian traders in Dakar, killing 61 Mauritanians. On 25 April, Mauritanian soldiers and border guards in Southern Mauritania retaliated by beating to death at least 200 Senegalese citizens in an event now referred to as 'Black Tuesday'. The violence between 21–25 April, led to a mass exodus of refugees from both sides.
Repatriation and expulsion In late April, both governments began the process of repatriating foreign nationals from each country. With assistance from the governments of France, Spain, Algeria, and Morocco, Mauritania and Senegal returned approximately 250,000 refugees to their country of origin. Approximately 75,000 Senegalese nationals returned to Senegal and 170,000 Mauritanian nationals returned to Mauritania. In September 1989, Egyptian president and newly elected Chairman of the OAU,
Hosni Mubarak, held a mediatory meeting between representatives from Senegal and Mauritania. The Mauritanian officials argued that hundreds of thousands of Mauritanians were being held hostage in Senegal and that Mauritanians were owed compensation for the massive amounts of goods they owned that were looted and destroyed by the Senegalese. The Senegalese representatives argued that the Mauritanian government had expelled a large number of black Mauritanian nationals to Senegal during the repatriation process. They also argued that the true border between the countries lay north of the river, according to a 1933 French colonial decree, and that Senegalese citizens were owed compensation for their goods destroyed by Mauritanians. The issues of compensation and the location of the border were the most important to each side and were also the most inflexible of all the issues. The two sides failed to reach a compromise.
Military engagement On 24 October 1989, there was a direct military engagement between the official militaries of Mauritania and Senegal, the first since the beginning of the conflict in April. In November 1989, the government of
Iraq supplied Mauritania with a large quantity of weapons and over 30 military advisors. The government of
Syria supplied Mauritania with a radar system. These additions allowed Mauritania to significantly increase its military operations. On 6 January 1990, both armies engaged in a heavy artillery battle near the village of Doundou, Senegal. Fighting continued in short bursts until the summer of 1991. Senegalese military forces fought alongside the
African Liberation Forces of Mauritania (FLAM), a militant organization of exiled black Mauritanians based in Senegal. FLAM heavily recruited black Mauritanians who had been exiled by Mauritania during the refugee repatriation process. ==Aftermath==