In 1938 he was posted to 112 Fighter Escadrille and participated in the September 1939 campaign in Poland, claiming a Ju 87 destroyed.

[1] Via Romania he escaped to France and in May 1940 he was posted to ECD I/55 flying the Bloch MB 152, where he claimed a He 111 destroyed.

With Jan Zumbach, Mirosław Ferić and Witold Łokuciewski, Daszewski was one of the famous "four musketeers" of Polish pilots fighting in the Battle of Britain.

On 7 September he was wounded in combat, suffering a severe thigh injury, returning to 303 Squadron on 27 December 1940.

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