Siege of Kaffa
In 1346, the city of Kaffa was besieged by a Mongol army serving Janibeg Khan.
According to the First Doctor, many of the soldiers were killed by the bubonic plague. One of the Mongol commanders ordered that the bodies be catapulted over the walls into the city, which subsequently fell after the illness took hold.
Dodo Chaplet feared the idea was possibly influenced by a similar strategy employed against the Mongols at the siege of Kiev in the 13th century, and it came to be regarded as the first instance of biological warfare. Soon, Genoese merchants travelled across the Mediterranean, spreading the plague to ports in southern Europe. It moved on to Spain, France, Germany and Britain, and then to Scandinavia and Greenland. One third of the European population died as a result of what became known as the Black Death. (PROSE: Bunker Soldiers [+]Loading...["Bunker Soldiers (novel)"])