Eighty years on from the Warsaw Ghetto Uprising, the presidents of Poland, Israel and Germany marked the heroism of those who took part with a warning to the world against sowing hatred on Wednesday. In 1940, German occupiers corralled over 400,000 Jews into a small section of the Polish capital, Warsaw from where most were then sent to camps to be killed or died from the conditions within the ghetto, but on 19th April 1943 hundreds took up arms.