under then-Colonel Hezekiah Bowen. The AFL acted in a very brutal and scorched-earth fashion, which quickly alienated the local people. The rebel invasion soon pitted ethnic Krahn sympathetic to the Doe regime against those victimized by it, the Gio and the Mano. Thousands of civilians were massacred on both sides. Hundreds of thousands fled their homes. The Monrovia Church massacre was carried out by approximately 30 ethnic Krahn government soldiers, killing 600 civilians in St. Peter's Lutheran Church, Monrovia, on 29 July 1990, the worst single atrocity of the First Liberian Civil War. By May 1990 the AFL had been forced back to Gbarnga, still under the control of Bowen's troops, but they lost the town to a NPFL assault on 28 May. By June 1990, Taylor's forces were laying siege to Monrovia. In July 1990, Prince Yormie Johnson split from Taylor and formed the Independent National Patriotic Front (INPFL). The INPFL and NPFL continued their siege on Monrovia, which the AFL defended. Johnson quickly took control of parts of Monrovia prompting evacuation of foreign nationals and diplomats by the US Navy in August. ECOWAS intervention force (August 1990) In August 1990, the 16-member Economic Community of West African States (ECOWAS) agreed to deploy a joint military intervention force, the Economic Community Monitoring Group (ECOMOG), and place it under Nigerian leadership. The mission later included troops from non-ECOWAS countries, including Uganda and Tanzania. ECOMOG's objectives were to impose a cease-fire; help Liberians establish an interim government until elections could be held; stop the killing of innocent civilians; and ensure the safe evacuation of foreign nationals. ECOMOG also sought to prevent the conflict from spreading into neighboring states, which share a complex history of state, economic, and ethno-linguistic social relations with Liberia. The Economic Community of West African States (ECOWAS) attempted to persuade Doe to resign and go into exile, but despite his weak position – besieged in his mansion – he refused. ECOMOG, an ECOWAS intervention force, arrived at the Freeport of Monrovia on August 24, 1990, landing from Nigerian and Ghanaian vessels. Capture and killing of Samuel Doe (September 1990) On 9 September 1990, Doe visited the barely established, newly arrived ECOMOG headquarters in the Free Port of Maher. Stephen Ellis says, his motive was to lay a complaint that the ECOMOG commander had not paid a courtesy call to Doe, the Head of State, however, the exact circumstances