Al-Amin vs Alexander the Great

Al-Amin's reign was dominated by the Fourth Fitna, a civil war against his brother al-Mamun. The conflict began when al-Amin tried to remove al-Mamun from succession, leading to a devastating war that weakened the Abbasid Caliphate.

Al-Mamun's forces, led by Tahir ibn Husayn, besieged Baghdad in 812-813. The siege lasted over a year, causing widespread destruction and famine. Al-Amin was captured and executed in 813, ending his caliphate.

After the fall of Baghdad, al-Amin was captured by Tahir's forces. He was executed on al-Mamun's orders, marking the end of the civil war and the beginning of al-Mamun's sole rule.

Alexander led his Macedonian army across the Hellespont into Asia Minor and defeated a Persian force under local satraps at the Granicus River. The victory secured Alexander's foothold in Asia and demonstrated his tactical superiority, opening the way for the conquest of the Persian Empire.

Alexander's army defeated the Persian king Darius III at Issus in Cilicia. Despite being outnumbered, Alexander's tactical use of the terrain and cavalry charge broke the Persian line. Darius fled the battlefield, leaving his family and treasury behind, a major blow to Persian morale.

Alexander besieged the island city of Tyre for seven months, constructing a causeway to breach its walls. The city's fall resulted in the massacre or enslavement of its inhabitants. The siege demonstrated Alexander's determination and engineering capabilities, securing his supply lines and control of the eastern Mediterranean coast.

Alexander faced Darius III at Gaugamela in Mesopotamia with a massive Persian army. Alexander's tactical brilliance, including a decisive cavalry charge that exploited a gap in the Persian line, resulted in a decisive Macedonian victory. Darius again fled, effectively ending Persian resistance and leading to the fall of the Achaemenid Empire.

Alexander founded the city of Alexandria on the Mediterranean coast of Egypt. He personally selected the site and oversaw the initial planning. Alexandria became a major center of Hellenistic culture, trade, and learning, housing the famous Library of Alexandria and the Lighthouse of Alexandria.

Alexander crossed the Indus River and defeated King Porus at the Battle of the Hydaspes. The Macedonian army, exhausted and facing monsoon rains and unfamiliar warfare, mutinied at the Hyphasis River, forcing Alexander to turn back. This campaign marked the easternmost extent of his conquests.