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Difference between Defend someone against something and Defend someone from something

defend someone against somethingprotect a person by repelling an attack against him:

  • The way to defend Milton against all impugners is to take down the book and read it.

defend someone from somethingkeep a person free from attack, danger, etc.:

  • The U.S. intelligence services sponsored his rise to power, and defended him from any credible opposition.