although outnumbered , the UNK were able to withstand Defending their enemy with techniques that included unk bunkers and the use Using of carefully placed UNK , or fortified Defending villages , that allowed Preventing_or_letting them to block Hiding_objects their enemy 's advance and often inflict Causation heavy losses Earnings_and_losses , yet quickly abandon GiveUp their positions without significant loss .

After the Grossaktion Warsaw of summer 1942 , in which more than a quarter of a million Jews were deported Removing from the ghetto to Treblinka and murdered Killing , the remaining Jews began Process_start to build Building bunkers and smuggle weapons and explosives into the ghetto .

Morris started Process_start badly and came to grief in several bunkers .