Dorbei Doqshin crossed the Indus for a second time. The Mongols first took Nandana  and then began to besiege the larger Multan. With no stones in the immediate area, the Mongols quarried elsewhere and shipped the stones by boat to Multan. They breached the wall, but due to the heat decided to fall back due before the city was finally taken. The siege lasted for 42 days (March–April 1224). They returned north via Ghazni.  
Dorbei Doqshin crossed the Indus for a second time. The Mongols first took Nandana from one of the lieutanants of Jalal ad-Din, sacked it and then began to besiege the larger Multan. With no stones in the immediate area, the Mongols quarried elsewhere and shipped the stones by boat to Multan. They breached the wall, the city of Multan was defended successfully by the Khwarazmians, Dorbei Doqshin was repelled and Dorbei Doq decided to retreat due to the climate before the city was finally taken. The siege lasted for 42 days (March–April 1224). They returned north via Ghazni. Later, Dorbei Doqshin was sent with the same mission again but during his second mission he joined Jalal ad-Din and converted to Islam. References
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from one of the lieutanants of Jalal ad-Din, sacked it
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but due to the heat decided to fall back due
the city of Multan was defended successfully by the Khwarazmians, Dorbei Doqshin was repelled and Dorbei Doq decided to retreat due to the climate
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Later, Dorbei Doqshin was sent with the same mission again but during his second mission he joined Jalal ad-Din and converted to Islam.
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References