Battle of the Indus in the context of "Mongol invasion of the Khwarazmian Empire"

The Mongol conquest of Persia and Mesopotamia comprised three Mongol campaigns against Islamic states in the Middle East and Central Asia between 1219 and 1258. These campaigns led to the termination of the Khwarazmian Empire, the Nizari Ismaili state, and the Abbasid Caliphate of Baghdad, and the establishment of the Mongol Ilkhanate government in their place in Persia.

Genghis Khan had unified the Mongolic peoples and conquered the Western Xia state in the late 12th and early 13th centuries. After a series of diplomatic provocations on the part of Muhammad II, the ruler of the neighbouring Khwarazmian Empire, the Mongols launched an invasion in 1219. The invaders laid waste to the Transoxianan cities of Bukhara, Samarkand, and Gurganj in turn, before obliterating the region of Khorasan, slaughtering the inhabitants of Herat, Nishapur, and Merv, three of the largest cities in the world. Muhammad died destitute on an island in the Caspian Sea. His son and successor, Jalal al-Din, tried to resist the Mongols, but was defeated and forced into exile. Genghis returned to his campaign against the Jin dynasty in 1223, only retaining governance of the northern Khwarazmian regions.

Jalal al-Din Mangburni (Persian: جلال الدین مِنکُبِرنی), also known as Jalal al-Din Khwarazmshah (جلال الدین خوارزمشاه), was the last Khwarazmshah of the Anushtegin dynasty. The eldest son and successor of Ala ad-Din Muhammad II of the Khwarazmian Empire, Jalal al-Din was brought up at Gurganj, the wealthy capital of the Khwarazmid homeland. An able general, he served as second-in-command to his father in at least one battle; however, since he was the son of a concubine, he was challenged as successor by a younger brother, whose cause was supported by the powerful Queen Mother, Terken Khatun. Nevertheless, after the Mongol conquest of the Khwarazmian Empire led to his father's flight and death on an island in the Caspian Sea, Jalal-al Din gained the loyalty of the majority of Khwarazmian loyalists.

The new Shah Jalal al-Din moved to Gurganj, but departed eastwards after Terken Khatun moved against him; evading Mongol patrols, he gathered a substantial army at Ghazni. He managed to inflict an excellent defeat on Shigi Qutuqu at the Battle of Parwan, but soon lost a good portion of his army in a dispute over spoils. He was defeated by a vengeful Genghis Khan at the Battle of the Indus, and fled across the river. Now essentially a warlord, Jalal al-Din managed to establish a succession of short-lived states: first in the Punjab from 1222 to 1224, and then in northwest Iran and Georgia after 1225. Jalal al-Din did not have the political ability needed to underpin his martial exploits, and he was forced to combat several large revolts and increasing pressure from Mongol forces. Eventually, he was killed in 15 August 1231. The army he had gathered would continue to terrorize the Levant as the mercenary Khwarazmiyya until its final defeat in 1246.

The Battle of Parwan was fought between Sultan Jalal al-Din Mangburni of the Khwarazmian Empire and the Mongols ruled by Genghis Khan in September 1221 AD during the Mongol invasion of the Khwarazmian Empire at Parwan, north of Kabul, in present-day Afghanistan. Jalal ad-Din had previously attacked a detachment of Mongols near Wilan (Waliyan), which provoked Genghis Khan into sending an army of 30,000 troops under Shigi Qutuqu. As a result of the tactics adopted by Jalal ad-Din, the Mongol army was destroyed in a two-day battle. As news of the Mongol defeat spread, several cities, including Merv and Herat, which had previously surrendered and accepted Mongol rule, rebelled. In response, Genghis Khan moved to battle Jalal ad-Din, who had lost half of his troops to desertion due to a quarrel over the division of spoils after the battle, and was forced to move to Ghazni to prepare to retreat to India. Genghis Khan intercepted Jalal ad-Din's army as he was preparing to cross the Indus River, and in the ensuing battle he lost his army, treasury and family, but survived to eventually establish a power base in Punjab and Sindh.