Operation Cobra's Anger was a US-led offensive in Helmand province in southern Afghanistan. About 1,000 Marines as well as 150 Afghan troops were involved. The operation began in the early hours of 4 December 2009. The main goal of the operation was to disrupt Taliban supply and communications lines in the strategic Now Zadvalley of Helmand province.
The operation began on 4 December 2009, when some 300 Marines from the 3rd Battalion, 4th Marines and the Marine recon unit Task Force Raider dropped into the Now Zad valley via CH-53Ehelicopters and V-22 Osprey aircraft. This was the first time the Osprey were used in combat operations in Afghanistan. In preparation for the Marine offensive the Taliban planted thousands of homemade bombs and dug in positions throughout the valley at the foot of the craggy Tangee Mountains.
By the end of the third day of the operation no major resistance had been encountered.