Australian Defence Force units arrived in East Timor in 1999 to quell the rioting, disorder and low-level fighting created by the Indonesian military's scorched earth campaign as it withdrew from its former possession in 1999. Australia led the INTERFET operation in 1999, and provided substantial forces to the subsequent United Nations Transitional Administration in East Timor and its successor operations. Australia also landed combat troops in the country in 2006 to quell ethnic fighting that involved East Timorese police and soldiers. The last Australian peacekeeping forces left Timor-Leste in December 2012.