Operation Dagger was a 2005 operation of the Iraq War.^[1] It took place in the southern Lake Tharthar region, in Al Anbar province and was conducted by the Regimental Combat Team-8, 2nd Marine Division.

Operation Dagger
Part of the Iraq War
Date 18 June 2005 Location Western Iraq Result US and New Iraqi Army failure, launch of Operation Spear
Belligerents
United States New Iraqi Army	Iraqi insurgents

The mission, which was to locate hidden weapons caches and enemy sanctuaries, was a failure. The mission followed Operation Spear, a similar operation.