Operation Hammerblow was an offensive Osean operation in the Union of Yuktobanian Republics during the Circum-Pacific War. Yuktobania was retreating their remaining forces from Osea's invasion of the Bastok Peninsula, and Osea sent Wardog Squadron to shoot down the retreating forces. This operation ran concurrently with the Grey Men's terrorist attack in the same area, resulting in both militaries suspecting Wardog of being the perpetrators. This would result in the Osean military interrogating Wardog as well as Yuktobania performing terrorist attacks in retaliation.