On 21 June 1998, Daniel Nivel, a 43-year-old member of the French National Gendarmerie, was assaulted in the city of Lens, France, by German football hooligans during the 1998 FIFA World Cup. The attack followed Germany's 2–2 draw against FR Yugoslavia at the Stade Félix Bollaert. Nivel was one of three Gendarmerie officers attacked; he was struck with advertising boards, and after losing his helmet and falling to the ground, he was stamped and kicked in the head. He fell into a coma that lasted until 4 August 1998 and was left with permanent disability affecting his speech and movement.
German Chancellor Helmut Kohl described the attack as a national disgrace; within the German Football Association, withdrawal of the national team from the tournament was briefly considered.
One attacker, Markus Warnecke, a Braunschweig native in his late twenties who worked as a bouncer and tattoo artist and was described as an alleged far-right activist, was arrested at the scene. He was tried in Saint-Omer, France, where prosecutors characterized him as the ringleader of the assault, a claim his defence disputed on the basis of photographic evidence. Facing a maximum sentence of 15 years, Warnecke was convicted and, in May 2001, sentenced to five years in prison. He was also banned from sports venues for five years and declared persona non grata in France for ten years.
Separately, four other men — Andre Zawacki, Frank Renger, Tobias Reifschlaeger, and Christopher Rauch — stood trial in Essen, Germany, beginning in April 1999. Zawacki, Renger, and Reifschlaeger confessed, while Rauch exercised his right to remain silent. Nivel, whose speech had been impaired by the attack, did not attend the start of proceedings. In November 1999, all four were convicted: Zawacki was sentenced to ten years in prison for attempted murder, while Reifschlaeger, Renger, and Rauch were convicted of serious bodily harm and sentenced to six, five, and three-and-a-half years respectively.
The case left a lasting legacy. At the Romania–Croatia match the day after the attack, Croatia's coach, Miroslav Blažević, was given a kepi — the type of cap worn by French Gendarmerie officers — by a colleague of Nivel's, and wore it for the rest of the tournament as a gesture of support. In 2000, the German Football Association (DFB) established the Daniel Nivel Foundation to oppose football hooliganism and support victims. Nivel was later honored at subsequent tournaments: on 14 June 2006 he was the DFB's guest of honor at Germany's World Cup match against Poland in Dortmund, seated next to Chancellor Angela Merkel, in a game that was itself marred by hooliganism, and he was again invited to Germany's UEFA Euro 2016 match against Ukraine in Lille, near Lens. On 16 October 2018, ahead of a UEFA Nations League match between France and Germany, Nivel was awarded the Order of Merit of the Federal Republic of Germany by German Minister of Foreign Affairs Heiko Maas in Paris.