Greek fire
Lecapenus arranged a defense of Constantinople by having 15 retired ships fitted out with throwers of Greek fire fore and aft. Igor, wishing to capture these Greek vessels and their crews but unaware of the fire-throwers, had his fleet surround them. Then, at an instant, the Greek-fire was hurled through tubes upon the Rus' and their allies; Liudprand of Cremona wrote: "The Rus', seeing the flames, jumped overboard, preferring water to fire. Some sank, weighed down by the weight of their breastplates and helmets; others caught fire." The captured Rus' were beheaded.