Answer: Carter attempted to rescue the hostages with military intervention.
Explanation: Pres. Carter, establishing that reasoning with Iran was not an optimal solution, resolved to sending in several US troops to secure and rescue the American hostages. They were to infiltrate Iranian airspace under cover of darkness and be dropped off, where they would then secure the Americans before exfiltration. Unfortunately, the Iranians were waiting for them and killed all of the American troops in an ambush.
Feudalism. Feudalism was the medieval model of government predating the birth of the modern nation-state. Feudal society is a military hierarchy in which a ruler or lord offers mounted fighters a fief (medieval beneficium), a unit of land to control in exchange for a military service.