20th anniversary of the 1989 Tiananmen Square protests protests of 1989, thousands of students and protests had gathered in Tiananmen square, when troops opened fire. An unknown number of people were wounded or died in the incident. As the People's Republic of China has publicly embraced the one country, two systems model of governance for Hong Kong, the annual 4 June observance which has become a tradition since 1989 has continued after the transfer of sovereignty from Britain to China. It is the only place on Chinese soil where the event is openly commemorated in any way and on any scale. The 20th anniversary was commemorated in the
Defend Tiananmen Square Headquarters Ling led the formation of crowd in the annunciation of the following oath on the Tiananmen Square: "I swear I will protect the republic and Tiananmen Square with my young life. Heads can roll, blood can flow, but the people's Square can never be lost! We are willing to fight to the last person." According to Chai Ling's book "", and Wu Renhua's book Major Events, Tiananmen 1989 at least one hundred thousand people gathered in the Square when Chai Ling took the oath. And some people joined them after Wang Dan announced the formation of the Defend Tiananmen Square