Final answer:
The number of casualties during the Ottoman siege in Vienna in 1529 is not specified in the provided information.
Step-by-step explanation:
The number of people who died in Vienna as the government tried to regain control of the city during the Ottoman siege in 1529 is not specified in the provided information. However, it is known that the Viennese defenders were able to repulse each of the Ottoman advances despite being greatly outnumbered. Unfortunately, without additional details, it is impossible to provide an exact number of casualties during this specific event.