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During the late Eastern Han Dynasty, Cao Cao campaigned against Ma Chao and Han Sui in the Yellow River region, defeating Ma Chao.
Ma Chao offered to cede territory for peace, but Cao Cao declined. After securing Weikou and fortifying his positions, Cao Cao feigned a willingness to negotiate while secretly accumulating strength.
He then launched a surprise attack on Ma Chao with a speed as sudden as thunder, leaving Ma Chao no time to react (迅雷不及掩耳). Ma Chao, completely unprepared, was utterly routed and fled in defeat.

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Open the tool →迅雷不及掩耳 (xùn léi bù jí yǎn ěr) is a Chinese idiom (chengyu) meaning “Extremely sudden and swift, allowing no time for reaction or defense”.
迅雷不及掩耳 is pronounced xùn léi bù jí yǎn ěr in Mandarin Chinese.
Literally, 迅雷不及掩耳 means “Thunder so swift one has no time to cover one's ears”. It is used to mean “Extremely sudden and swift, allowing no time for reaction or defense”.
迅雷不及掩耳 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
雷声来得非常快,连捂耳朵都来不及。比喻来势凶猛,使人来不及防备。