The Dochula Druk Wangyel Festival was established in 2011 in commemoration of His Majesty the Fourth Druk Gyalpo and the Armed Forces’ victory over Indian insurgent forces residing in southern Bhutan in 2003.
The Tshechu is takes place every December 13th at the Druk Wangyal Lhakhang Festival Ground located at Dochula Pass around 22km from the capital city Thimphu. Dochula Pass is one of the most scenic locations in the entire kingdom, offering a stunning panoramic view of the Himalayan mountain range. Set amidst this breathtaking backdrop, the Dochula Druk Wangyal Tsehchu is an experience unlike any other and true exemplifies Bhutanese cultural traditions.
The Druk Wangyal Lhakhang was built over a period of four years (2004-2008) under the vision and patronage of Her Majesty the Queen Mother Ashi Dorji Wangmo. The Lhakhang honors the courageous service of the Fourth King, who personally led the troops against the insurgents, as well as the regular Armed Forces of the country
Source: http://www.tourism.gov.bt/activities/dochula-druk-wangyel-festival#sthash.WKlyA4YA.dpuf