On October 16, 2011, Kenyan sent several hundred troops into battle against the Shabab militant group. Armored trucks, tanks and helicopters were also sent. Helicopters bombed Shabab bases. More Kenyan troops were sent in later with the goal to clear the Shabab out. It was a rare aggressive act by a country known for its laidback foreign policy. The act came as a surprise to the United States, an ally of Kenya. The U.S. had no advance knowledge of the invasion.
The Shabab, an insurgent group, has killed scores of civilians, carried out numerous suicide bomb missions and sworn their allegiance to Al-Qaeda. The Kenyan government justified its invasion, blaming the Shabab for a series of recent kidnappings in Kenya.