The League of Nations became involved in the subsequent Lithuanian self defense from Poland after it attacked Lithuanian army positions in the south west of Lithuania. The League brokered the ceasefire called the Suwałki Agreement on 7 October 1920. Lithuanians believed that it stopped a Polish aggression. Although neither Vilnius or the surrounding region was explicitly addressed in the agreement, numerous historians have described the agreement as allotting Vilnius to Lithuania. On 9 October 1920, the Polish Army surreptitiously, under General Lucjan Żeligowski, seized Vilnius during an operation known as Żeligowski's Mutiny. The city and its surroundings were designated as a separate state, called the Republic of Central Lithuania.