The success of the defenders was the starting point of a brilliant career for their commander, Jean-Louis Raduit de Souches,[3] in the service of the Habsburgs; the siege kept the Swedish army occupied for several months.

In 1636, Emperor Ferdinand II of Habsburg made Brno the metropolis of Moravia, as he had established his governorship here, the so-called "Royal Tribunal".

On 31 January 1645, the Swedes invaded the lands of the Bohemian Crown via the Ore Mountains and on March 6, in the Battle of Jankau,[5] they defeated the imperial army of Ferdinand III.

For Swedish general Torstensson, who just finished the campaign called Torstenson War, and his army this victory opened the way for the march on Vienna.

The situation forced him to stop in front of the Austrian metropolis, however, as his army was now clearly exhausted and lacked the supplies that were essential for besieging a large city.

Although, in July, Swedes were able to dig the tunnels under the fortification walls and create a light damage to the structure by firing up gunpowder mines.

After Torstensson, in the beginning of August, realized that Rákóczi family was negotiating with the emperor about peace, he ordered to prepare the last attempt to conquer the city.

The successful operations of the imperial forces in Bohemia and Silesia prevented Torstensson's successor, Lieutenant General Arvid Wittenberg, from making further advances into what is now the Austrian state of Lower Austria in the following year.