A few people have mentioned the scythe as a weapon of war. Don't confuse specially altered blades adapted for fighting for the actual agricultural tool. Whilst agricultural scythes were certainly used in extremis, scythes carried as more formal weapons were not simple agricultural tools but were specially adapted, usually by altering the angle of the blade to resemble a fauchard (the weapon that evolved from the scythe) or glaive. Swinging a scythe in arcs to try to cut the enemy off at the knee is not going to be an optimum tactic.