The Bulgarian Land Forces are the ground warfare branch of the Military of Bulgaria. The Land Forces were established in 1878, when they were composed of anti-Ottoman militia (opalchentsi) and were the only branch of the Bulgarian military. The Land Forces are administered by the Ministry of Defence, previously known as the Ministry of War during the Kingdom of Bulgaria. Since 2004, the Land Forces are in a process of continued restructuring. Under the most recent reform, brigades were reduced to regiments, while several garrisons and brigades were disbanded. The Land Forces are functionally divided into 'Active" and "Reserve Forces". Their main functions include deterrence, defense, peace support and crisis management, humanitarian and rescue missions, as well as social functions within Bulgarian society. The Active Forces mainly have peacekeeping and defensive duties, and are further divided into Deployment Forces, Immediate Reaction, and Main Defense Forces. The Reserve Forces consists of Enhancement Forces, Territorial Defense Forces, and Training Grounds. They deal with planning and reservist preparation, armaments and equipment storage, training of formations for active forces rotation or increase in personnel. During peacetime the Land Forces maintain permanent combat and mobilization readiness. They become part of multinational military formations in compliance with international treaties Bulgaria is a Party of, participate in the preparation of the population, the national economy and the maintenance of wartime reserves and the infrastructure of the country for defense. In times of crisis the Land Forces' main tasks relate to participation in operations countering terrorist activities and defense of strategic facilities (such as nuclear power plants and major industrial facilities), assisting the security forces in preventing proliferation of weapons of mass destruction, illegal armaments traffic and international terrorism. In case of low- and medium-intensity military conflict the Active Forces that are part of the Land Forces participate in carrying out the initial tasks for the defense of the territorial integrity and sovereignty of the country. In case of a military conflict of high intensity the Land Forces, together with the Air Force and the Navy, form the defense group of the Bulgarian Military aiming at countering aggression and protection of the territorial integrity and sovereignty of the country.