How to say "siege" in Japanese

• 包囲ほういCommon
  noun, suru verb, transitive verbThe military sense of 'siege': troops surrounding a castle, fortress, or city to cut it off and force its surrender; also encirclement or envelopment more generally, as in military history and news.
  警察けいさつはその建物たてものを包囲ほういした。↗

  The police have surrounded the building.
• 囲みかこみCommon
  nounA general word for the act of surrounding or enclosing something; for an actual military siege, 包囲 is the word you want, and 囲み alone seldom carries that specific sense.

For a military siege—surrounding a castle or city to force surrender—包囲 is the word; 「囲み」 is a general noun for surrounding or enclosing, so it only loosely suggests a siege.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 包囲ほういsiege
• 攻囲こういsiege
• 包囲戦ほういせんsiege
• 攻城戦こうじょうせんsiege
• 囲みかこみsiege