Following are a number of back-translations as well as a sample translation for translators of Joel 3:9:

• Kupsabiny: “God is saying,
  ‘Announce this word to the people of other communities.
  Prepare yourselves for war.
  Gather the soldiers.
  Let them come to start the war.” (Source: Kupsabiny Back Translation)
• Newari: “Make this announcement among the nations:
  prepare for battle!
  Call your mighty men!
  Gather all the soldiers and attack!” (Source: Newari Back Translation)
• Hiligaynon: “Let- this -be-known to the nations: [You (plur.)] get-ready/prepare to fight. [You (plur.)] challenge your (plur.) soldiers to-attack.” (Source: Hiligaynon Back Translation)
• Kankanaey: “‘Make- this -known to all nations: ‘Prepare to make-war! Call all your soldiers so-that you will go.” (Source: Kankanaey Back Translation)
• English: “Proclaim to the people of all nations,
  ‘Prepare for a war!
  Summon your soldiers,
  and tell them to stand in their battle positions.” (Source: Translation for Translators)