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A sky attack is an air raid / air attack. Tora tora tora!
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
僕が空を見上げると、ちょうど空襲が始まるところだった。
When I looked up at the sky, the air raid was just about to happen.
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