The city was robbed of everything that was of value, including window frames, marble fireplaces, floors, tiles, columns and stairs.

Meanwhile, Charles X Gustav, after a short rest, left Warsaw (April 17), and marched with his soldiers to Greater Poland, to fight local anti-Swedish insurrection and Polish armies of Stefan Czarniecki and Jerzy Lubomirski.

At the same time, Swedish engineers turned monasteries, palaces and churches along Krakowskie Przedmieście into fortified strongholds.

On the next day, a Swedish unit under Colonel Forgell left Warsaw and in a surprise attack, captured two cannons, killing a number of soldiers.

On the same day, Polish infantry crossed the Vistula, on a pontoon bridge built by Lithuanians, taking positions in Ujazdów.

On June 2, Jan Kazimierz ordered his Chancellor Stefan Korycinski, to contact Arvid Wittenberg with a generous offer of surrender.

Altogether, Polish-Lithuanian Army consisted of some 29,000 soldiers (22,000 Poles, 7,000 Lithuanians), 18,000 pospolite ruszenie, and several thousand peasants.

The main Polish effort was concentrated in southwest, especially in the fortified buildings of Krakowskie Przedmiescie, whose capture opened the way to the Royal Palace.

Polish leaders hoped that after capture of external Swedish positions, Wittenberg would come to the conclusion that his situation was hopeless and capitulate.

In return, Wittenberg sent 200 infantry and two cavalry regiments for a surprise attack, which was repelled with heavy losses on both sides.

The attack was not a complete failure, as Polish forces captured the Palace of Bishops of Kraków, which became a convenient spot for the artillery.

On June 13, Swedish division under Adolph John I, Count Palatine of Kleeburg, sent by Charles Gustav from Royal Prussia, reached Modlin, where it camped, preparing for crossing of the Narew.

On June 26, while awaiting heavy artillery from Zamość, Jan Kazimierz urged Wittenberg to capitulate, but again was refused.

During the negotiations, which took place in the Ossolinski Palace, Swedish side presented several demands, while Poles insisted on unconditional surrender.

Before that happened, Swedish dames were inspected, as many of them broke conditions of capitulation, and hid stolen valuables under their clothes.

Since Polish rank and file vehemently protested against too mild conditions, King Jan Kazimierz decided to change them, and sent Swedish officers, together with Wittenberg, to a dungeon in Zamość.