[4] Polish forces were commanded either by hetman Jerzy Sebastian Lubomirski or general Krzysztof Grodzicki (sources vary).

The battle ended with the Polish victory, after a week-long siege; however much of the city was destroyed in a fire.

Swedes had taken Grudziądz on December 13, 1655,[5] after their failed attempt at conquering Denmark followed by the subsequent march along the Baltic coast.

[6] Along with Stefan Czarniecki arrived the Polish Prince Jerzy Sebastian Lubomirski – Field Crown Hetman since 1658, who approached Grudziądz Fortress in mid-August.

[7] The campaign was won also thanks to the devotion of local government (Starostwo) and Marie Louise Gonzaga who raised the sum of 1,415 Polish zloty to pay for the maintenance of the army.