In 1900, in what became known as the Boxer Rebellion (or the Boxer Uprising), a Chinese secret organization called the Society of the Righteous and Harmonious Fists led an uprising in northern China against the spread of Western and Japanese influence there. The rebels, referred to by Westerners as Boxers because they performed physical exercises they believed would make them able to withstand bullets, killed foreigners and Chinese Christians and destroyed foreign property.