The Battle of Chu-Dreh Pass also known as the Ambush at Chu-Dreh Pass and Operation Myosotis was the last battle of the First Indochina War between French Union and Viet Minh forces that took place on 17 July 1954, in the Central Highlands of French Indochina. It ended with the French battle group, 'Groupement Mobile No. 42' suffering heavy losses and the near destruction of the veteran Corée battalion. This was the last battle of the war with the Geneva Accords signed just four days later.