Child soldiers and other combatants were routinely addicted to cocaine, khat, and other drugs as a means of control. Several warlords felt that cocaine made soldiers more effective in battle. In November 1997, following the completion of the mandate of the United Nations Observer Mission in Liberia UNOMIL on 30 September, the United Nations established the United Nations Peace-building Support Office in Liberia (UNOL), headed by a representative of the Secretary-General. That first United Nations post-conflict peace-building support office was tasked primarily with assisting the government in consolidating peace following the July 1997 multiparty elections. On September 11, 2003, UN Secretary General Kofi Annan recommended deployment of the peacekeeping mission, the United Nations Mission in Liberia (UNMIL), to maintain the peace agreement. The UN Security Council approved the mission on September 19 in Resolution 1509. Nigeria sent in peacekeepers as part of the interim ECOWAS force. UNMIL was made up of over 15,000 personnel, including both military and civilian troops. The bulk of the personnel were armed military troops, but there were also civilian policemen, as well as political advisers and humanitarian aid workers. On October 1, the first peacekeepers changed their berets and became a UN force, with many more troops earmarked. During three days of riots in Monrovia in October 2004, nearly 400 people were wounded and 15 killed. The UN slowly built up its forces in the country, with 5,500 projected to be in place by November 2003, and worked to disarm the various factions. However, instability in neighbouring countries, an incomplete disarmament process, and general discontent threatened Liberia's fragile peace. A group of Liberian women headed by Leymah Gbowee formed an organization called "Women of Liberia Mass Action for Peace" and forced a meeting with President Charles Taylor, extracting a promise from him to attend peace talks in Ghana. A delegation of women organized nonviolence protests and continued to apply pressure on the warring factions during the peace process. They staged a silent protest outside of the Presidential Palace, bringing about an agreement during the stalled peace talks. Their creative non-violent protest allowed them to use the power within women and mothers of Liberia; tactics included a sex strike until their men chose to set aside weapons, and threatening to undress during a sit in outside the peace talks in Ghana. Working together, over 3,000 Christian and Muslim women mobilized their efforts, and as a result, the women were able to achieve peace in Liberia after a 14-year civil war and helped bring to power the country's first female president.