On 19 August 2002, a group of Chechen separatists armed with a man-portable air-defense system brought down a Russian Mil Mi-26 helicopter in a minefield, which resulted in the death of 127 Russian soldiers in the greatest loss of life in the history of helicopter aviation. It was also the most deadly aviation disaster ever suffered by the Russian Armed Forces, as well as its worst loss of life in a single day since 1999.