Six Afghan troops were also killed by German friendly fire. Furthermore, coalition ground troops and responding US MEDEVAC helicopters belonging to the US Army's 158th Aviation Regiment sustained considerable combat damage in a hail of small arms fire. The American helicopters and the responding German forces saved the platoon from almost certain annihilation. The Battle of Isa Khel went down into German military history as the most bloody engagement German troops have been involved in since the end of World War II. During the months to follow 21 soldiers were awarded for exceptional bravery. Three Germans were awarded with the nation's highest award for valor; 14 Americans were awarded with the second-highest award. News images of sandal-clad Taliban warriors rejoicing on the scarred wrecks of the most modern German military technology had a strong effect on the German public. The following weeks saw daily clashes that killed two US soldiers and three others killed by a roadside bomb on June 16. On June 27, four Norwegian troops were killed by a roadside bomb in the course of a series of operations aimed at increasing coalition and government presence in Ghowrmach, another hotspot in the northern allies' area of responsibility. The mission of the Norwegian forces was to provide mentoring and fire support for Afghan security forces which were initially poorly trained and lacked strength, equipment and leadership. The Norwegian forces killed 150 insurgents during the second half of the year, effectively putting a pressure upon insurgent militias in RC-Ns comprehensive security approach to regain control over the entire north of Afghanistan. Operations Taohid I, II& III (Unity) While coalition forces were gaining the upper hand in Kunduz and in Faryab, their commanders feared the recent victories were all but in vain if the insurgent presence in the adjacent Baghlan province was left to act at will. Later that month, a multi-national force launched a series of Operations dubbed Operation Taohid in order to drive insurgents out of the so-called Pashtun Corridor. On April 11, 2010, one American who was part of the Hungary-United States Operational Mentor and Liaison Team 9.3 was wounded in combat by an RPG while returning fire from his fighting position. Also one Afghan police officer was wounded in the back blast of an RPG being fired back at the Taliban. On April 15, four Germans were killed in action and five wounded when their armoured vehicle