Rwandan genocide training to the Banyamulenge, a Tutsi group in the Zairian South Kivu province, helping them to defeat Zairian security forces. Rwandan forces, the Banyamulenge, and other Zairian Tutsi, then attacked the refugee camps, targeting the Hutu militia. These attacks caused hundreds of thousands of refugees to flee; many returned to Rwanda despite the presence of the RPF, while others ventured further west into Zaire. The defeated forces of the former regime continued a cross-border insurgency campaign, supported initially by the predominantly Hutu population of Rwanda's northwestern provinces. By 1999, a programme of propaganda and Hutu integration into the national army,
Hutu Power and declared that any Hutu who did business with a Tutsi was a traitor to the Hutu people. The Commandments declared that "The Hutu should stop having mercy on the Tutsi" and referred to the Tutsis as "common Tutsi enemy". The Rwandan kingdom was traditionally ruled by a Tutsi mwami, or king; Historical evidence suggests that Hutu and Twa were included in government, although the Twa significantly less so than Hutu, who were more numerous. The Tutsi/Hutu divide has been referred to as a caste system. A Hutu could gain Tutsi status through marriage or through success. Tutsis, being primarily