Jews mainly used unarmed resistance in Eastern Europe; for instance, young Jews smuggled food or secretly took people into the forests in Sobibór and Treblinka death camps, whereas in Western Europe, they used armed resistance. Between April and May 1943, Jewish men and women of the Warsaw Ghetto took up arms and rebelled against the Nazis after it became clear that the Germans were deporting remaining Ghetto inhabitants to the Treblinka extermination camp. Warsaw Jews of the Jewish Combat Organization and the Jewish Military Union fought the Germans with a handful of small arms and Molotov cocktails, as Polish resistance attacked from the outside in support. After fierce fighting, vastly superior German forces pacified the Warsaw Ghetto and either murdered or deported all of the remaining inhabitants to the Nazi killing centers. The Germans claimed that they lost 18 dead and 85 wounded, though this figure has been disputed, with resistance leader Marek Edelman estimating 300 German casualties. Some 13,000 Jews were killed, and 56,885 were deported to concentration camps. There are two main reasons why Jews failed to resist when they were leaving the ghettos: Nazis' powerful army and also, it was difficult for Jews to get armed resistance because they needed others' support and because they lacked the ability to get arms when they were in ghettos.