Duars, also spelled Dwars or Dooars, region of northeastern India, at the foot of the east-central Himalayas. ... The Western Duars lies in northern West Bengal state and is a portion of the Tarai, a lowland belt linking the Himalayas and the plains region. The Western Duars is an important centre of the tea industry
They were successful because their goal was to get rid of slavery and have the union win the civil war. They were able to get the 13th amendment passed (with the bribery of some Democrats) and win the civil war in four years.