Final answer:
Khorramshahr was captured during the Iran-Iraq War on October 26, 1980.
Step-by-step explanation:
The city of Khorramshahr was captured during the Iran-Iraq War. It fell to Iraqi forces on October 26, 1980. This marked the beginning of a long and brutal siege on the city that lasted for over a year. The capture of Khorramshahr was a significant event in the war and had major implications for the course of the conflict.