During advanced preparations, the uprising conspiracy was uncovered in Warsaw by the Russian ambassador Iosif Igelström, who arrested activists and moved to accelerate the reduction of the Commonwealth armed forces, already ordered by the Grodno Sejm. Some Polish forces were being disbanded, other incorporated into the Russian army. Brigadier Antoni Madaliński, stationed in Ostrołęka in Mazovia, refused to cooperate and went with his unit toward Kraków, seeking to join Kościuszko, who was already present in the area. Igelström ordered a pursuit, but also evacuated Kraków, to concentrate the Russian forces in Warsaw area. Kościuszko arrived in Kraków and on March 24, 1794, officially declared in the main town square the act of the uprising.