The chronological order of the events is:
1. Iran's armed forces are weakened by the revolution.
2. Iraq attacks Khuzestan.
3. Iran pushes back hard against Iraq.
4. Khorramshahr is captured.
5. Peace is declared.
Step-by-step explanation:
The Iranian Revolution, which took place in 1979, weakened the country's armed forces, making it vulnerable to attack. In 1980, Iraq took advantage of this weakness and launched a surprise attack on the Iranian province of Khuzestan. Iran responded with a counteroffensive, pushing back against Iraq in a series of battles that lasted several years.