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In page Sino-Indian War:

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Chinese troops launched an attack on the southern banks of the Namka Chu River on 20 October.[1] The Indian forces were undermanned, with only an understrength battalion to support them, while the Chinese troops had three regiments positioned on the north side of the river.[1] The Indians expected Chinese forces to cross via one of five bridges over the river and defended those crossings.[citation needed] The PLA bypassed the defenders by fording the river, which was shallow at that time of year, instead. They formed up into battalions on the Indian-held south side of the river under cover of darkness, with each battalion assigned against a separate group of Rajputs.[1]