In 1635, Stanisław Koniecpolski was still considered a powerful Grand Hetman of the Polish-Lithuanian Commonwealth. Władysław IV Vasa allowed Koniecpolski what amounted to the powers of a viceroy in the southwestern area of the Commonwealth. Also Koniecpolski possessed the most extensive spy network in the Commonwealth, which penetrated Russia as well as the Ottoman and Tatar realms.
Koniecpolski was a skilled archer, both foot and mounted, and was known for having a supple and flexible mind where military matters were concerned. He was also known for not applying that flexibility to social and political matters.
During the invasion by Swedish and USE forces, Koniecpolski used delaying tactics while waiting for bad weather, knowing that would neutralize the USE's airplanes and APCs. This kept Gustavus's forces from being able to unite against him, and allowed the Poles to capture an APC that had become hopelessly bogged down.
By February of 1636, it was apparent that Koniecpolski would have preferred a peace settlement with the USE, even though he accepted that the King and Sejm were adamantly opposed to one. He was aware of the civil unrest within the USE, knew that the USE troops around Poznań were getting restive, and wanted to march on Berlin, and knew that Michael Stearns, who was widely known to have opposed the invasion, would prevail if he had those divisions in addition to his own.