Great Wall of China

• emperor (n)


  the leader of an empire
• empire 


  many countries or territories under one ruler
• unified (a)


  working as one
• nomads (n)


  people move 1 place to another instead of living in the same area for a long time
• fortification (n)


  structure used to protect a place or people
• subsequent (a)


  later or happening after
• formidable (a)


  difficult to deal with
• manual labor


  work done by hand that requires physical strength
• span (v)


  stretches out across or extends over

  Ex: The bridge spans the river
• plateau (n)


  large area of land that is high and flat

  
• thwart (n)


  stop or prevent

  Ex: Davison worried that the stormy weather would thwart his plans to go swimming in the lake
• summoned (v)


  ordered to come to a place
• beacons (n)


  things, such as light or fire, used to signal or guide from far away.

  Ex: Lighthouses send beacons of light onto the ocean at night.
• mobile (a)


  able to move
• reserves 


  soldiers ready to fight when the need arises
• What is the purpose of using beacons?


  to signal or guide from far away
• Invade (v)


  (of an armed force or its commander) enter (a country or region) so as to subjugate or occupy it.