In 1651, during an expedition against the Cossacks, the king ordered to confiscate all belongings of Radziejowski for safe keeping. Among the most important was a letter to the Queen, in which Radziejowski heavily criticized John Casimir, for the conduct of the expedition and also suggested that the king was having an affair with his wife (who accompanied him in the expedition). After the king found out about the note, Deputy Chancellor Radziejowski was instantly and permanently removed from the Sejm. Radziejowski then, in revenge, spread rumors about the hostility of the king in relation to the nobility. However, before the Battle of Berestechko, Radziejowski reconciled with the monarch. Despite this, a conflict erupted again after the campaign. Working with Radziejowski was another nobleman, Marcin Dębicki, who headed the General Nobility Movement (the regional military council) and also accused the monarch of inept command and that the royal units allowed the Cossacks to retreat and escape during the counter-attack of the Polish army. Radziejowski himself proposed to dissolve the militia (known as pospolite ruszenie) and begin negotiations with the rebel army under the command of Bohdan Khmelnytsky, and when the council that he supported did not obey his demands, Radziejowski left the camp which led to a significant part of the nobility leaving the battlefield and not aiding the king.