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During the late Eastern Han Dynasty, Cao Cao attacked Ma Chao and Han Sui in the Yellow River basin, defeating Ma Chao.
Ma Chao requested to cede land for peace, but Cao Cao refused.
After occupying Weikou and building fortifications, Cao Cao ostensibly agreed to peace talks while secretly gathering strength.
Then, with the suddenness of a clap of thunder (疾雷不及掩耳), he launched a surprise attack on Ma Chao, who was completely unprepared, routing him and forcing him to flee in defeat.

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Open the tool →疾雷不及掩耳 (jí léi bù jí yǎn ěr) is a Chinese idiom (chengyu) meaning “as sudden as a peal of thunder, allowing no time to cover one's ears”.
疾雷不及掩耳 is pronounced jí léi bù jí yǎn ěr in Mandarin Chinese.
Literally, 疾雷不及掩耳 means “Swift thunder gives no time to cover ears”. It is used to mean “as sudden as a peal of thunder, allowing no time to cover one's ears”.
疾雷不及掩耳 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
突然响起雷声,使人来不及掩耳。比喻事情或动作来得突然,使人来不及防备。