The Bastille prison was rumored to be holding political prisoners. (Enemies of the King.) To many, this was a symbol of oppression. This made them very angry. They demanded that the leader of the Bastille give them his gunpowder. He refused.
On the morning of July 14th, the Bastille prison's courtyard and later fortress were broken into. The soldiers were scared and fired into the crowd. The turning point occurred when some soldiers joined the crowd's side.
Knowing he would lose, Governor de Launay surrendered. After he surrendered, three fellow officers and himself were executed by the mob. The people got their gunpowder. Approximately 100 people were killed total.