 Complete the following phrase:  Von Guericke was the offspring of one of Magdeburgs leading patrician families, that were well educated and well connected. His father and grandfather had been life-long members of the city council and at various occasions during their careers been appointed to serve as mayor of the city. In 1626 Otto von Guericke started his career as political representative of Magdeburg and accepted an official appointment to join the city council. However, in 1618 the Thirty Years War had broken out. This exceptionally long, tragic and destructive conflict would soon also descend upon Magdeburg. Only a few years later, he had luckily fled from the city before an army of the imperial Catholic League, led by the Count of Tilly had completely surrounded and cut off Magdeburg. The attack culminated in the single most devastating event of the entire war, namely the 