How have Yemen's rebels survived the Saudi-led onslaught?

The movement, which takes its name from late spiritual leader Badreddin al-Huthi and his son Hussein, rose up in the 1990s over alleged sectarian discrimination. Between 2004 and 2010, the Huthis fought six wars against Yemen's then-government and battled Saudi Arabia in 2009-2010 after storming over the border.
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