premise: Dozens of war veterans disabled by chemical weapon attacks during the 1980-1988 war against Iraq staged a sit-in Thursday in front of the German embassy here to protest alleged chemical aid to Baghdad by German firms.
  They began their protest on Wednesday along with thousands of other people, and some 200 people stayed camped outside the mission overnight.
  The veterans, who included patients who left hospital for the protest, set up a canvas awning on the pavement in front of the embassy compound to shelter them from rain.
  They are also protesting a German court ruling accusing the Iranian government in the 1992 murder of four Kurdish dissidents in Berlin. The veterans have vowed to stay there until Bonn appologizes to Tehran for the "insult."
   What does "camped" refer to?
hypothesis: chemical weapon attacks during the 1980-1988 war against Iraq