Operation Halmazag (Dari for "lightning") was an offensive operation by ISAF German-led troops in close cooperation with the Afghan security forces in the province of Kunduz, from 31 October to 4 November 2010, with the aim of building a permanent outpost near the village of Quatliam in the Char Dara district, south-west of Kunduz. The operation was the first German military ground offensive since World War II.

Until 2009, German troops were involved only in a handful of firefights with Taliban militants. Between April and June, the number of direct contacts had already topped the total of the seven years before. A similar development struck Faryab province and the surrounding districts: Having already taken up actions to put the Taliban at rout, Norwegian forces saw themselves increasingly threatened by insurgent activities.

With casualties rising, the German leadership was prompted to revise the rules of engagement for its troops in early 2009. The German military began joint operations with Afghan security forces in accordance to the "Afghan-face" strategy of ISAF in April 2009 and continued to conduct own operations to improve the security as well as supporting other allies in their own struggle. By 2009, there were three major hotspots: the insurgency of the Taliban in Kunduz' Char Dara district, the presence of armed militants in Baghlan province and the militants' activities in Faryab province.

Following the Kunduz airstrike against two captured fuel tankers in September 2009, Germany reclassified the Afghanistan deployment in February 2010 as an "armed conflict within the parameters of international law", allowing German forces to act without risk of prosecution under German law. In early 2010 as well, US troops were poured into Northern Afghanistan and Regional Command North upgraded to be led by a major general in the future.

On 2 April 2010, the largest battle since the fall of the Kunduz in 2001 took place when a large group of insurgents attacked 28 German paratroopers in the vicinity of Isa Khel and a nearby Afghan police station. Three German soldiers died of wounds sustained in combat and eight suffered wounds and injuries of varying degree. Six Afghan troops were killed by friendly fire when the crew of a German infantry fighting vehicle mistook these reinforcements for insurgents. The battle of Isa was the most bloody hostile encounter German troops have been involved in since the end of World War II. Twenty-one troops were honored for their bravery, among them 14 American servicemen of the 158th Aviation Regiment.

Operation Halmazag was conceived in line with the four-step counterinsurgency doctrine of "Shape-Clear-Hold-Build". This strategy is described in the US Army Field Manual 3-24 Counterinsurgency. The sequence consists in a previous contact with local friendly authorities to convince the population about the advantages of an improving security environment (shape), the elimination of open insurgent activities (clear), taking measures to make impossible the return of open insurgent presence (hold), and securing the effectiveness of the local government and forces to prevent any further insurgent activity (build). Halzamag was the first operation in Afghanistan whose planning and execution was conducted by the Bundeswehr. A key development toward normalization would be the building of a concrete road linking Char Dara with Quatliam and Isa Khel, under the codename "Little Pluto".

The main offensive force was led by the paratrooper battalion 313 (based in Seedorf, Germany). Scouts had learned that in the village Quatliam the support of the Taliban was not as high as in other parts of the area, thus this point would be the main focus of the ground attack. The plan was simple: Afghan police, backed by the US Army 1-87 infantry regiment, would march along the eastern flank, along Kunduz River, toward the village of Isa Khel, while German armored troops would secure the trail between Isa Khel and Quatliam. Then the German paratroopers, reinforced by a unit of the Afghan army, would move in from the north, outflanking the Taliban in Quatliam, with the Afghan army taking positions on the west of the village and the Germans on the east. Afghan militias, supported by 150 American infantry troops, would close the circle from the south, forcing the insurgents to surrender or flee.

During the approaching phase of the operation, the insurgents attempted to ambush coalition troops with small arms and antitank weapons. Before closing the grip around the village Quatliam, there were three bomb attacks (IEDs) against US reconnaissance forces from the south and two German Marder armored personnel carriers covering the route between Isa Khel and Quatliam. One American minesweeping vehicle and the armored personnel carriers were damaged in the process and returned to Kunduz. Two German soldiers and three US servicemen were slightly wounded.