The ofensiva hasta el tope ("to-the-top offensive") was the major engagement of the Salvadoran Civil War. The battle, fought between the Farabundo Martí National Liberation Front (in Spanish: Frente Farabundo Martí para la Liberación Nacional, FMLN) Marxist guerrilla and the Salvadoran government, lasted from the 11 November to early December 1989. Sometimes referred to as "Ofensiva fuera los fascistas. Febe Elizabeth vive", ("Offensive to drive out the fascists. Febe Elizabeth lives".) in honor of an assassinated union leader, it was the most brutal confrontation in the entire conflict, amounting for seventeen percent of the total casualties in ten years of warfare.