"The Erna Raid (Estonian: Erna retk) is an annual international military exercise and competition, one of the longest and most difficult in the world, held every August since 1995 in Estonia. It is organised by the Erna Society and commemorates the actions of the long-range recce group Erna in the summer of 1941.
Foreign teams have always been welcome to partake in the competition. In 2007, 28 teams from 9 different countries participated: Estonia (18 teams), Czech Republic (1), Denmark (1), Finland (2), Germany (1), Norway (2), Portugal (1), Sweden (1) and USA (1), of which Portugal and Czech Republic are newcomers. Teams from United Kingdom have participated in earlier years (most recently, a British Territorial Army team in 2006) but only be observed in 2007. A team from Cyprus also be observed. Teams from People's Republic of China have been traditionally successful in the competition and took 1st and 2nd place in 2002. Other successful teams have come from Finland and Norway." Extracted from Wiki the official website please visit this link.
http://www.erna.ee/en/
Foreign teams have always been welcome to partake in the competition. In 2007, 28 teams from 9 different countries participated: Estonia (18 teams), Czech Republic (1), Denmark (1), Finland (2), Germany (1), Norway (2), Portugal (1), Sweden (1) and USA (1), of which Portugal and Czech Republic are newcomers. Teams from United Kingdom have participated in earlier years (most recently, a British Territorial Army team in 2006) but only be observed in 2007. A team from Cyprus also be observed. Teams from People's Republic of China have been traditionally successful in the competition and took 1st and 2nd place in 2002. Other successful teams have come from Finland and Norway." Extracted from Wiki the official website please visit this link.
http://www.erna.ee/en/