They got the enigma machine to us. Being able to read the NAZI leadership orders was immensely valuable in winning the war.
Poland lost nearly 25% of its population in the war, to Germans, and then, the Soviets. They never surrendered to the NAZIs.
Read a story just last week about the sinking of the bismarck.
After it was able to avoid the British navy following sinking of Hood,
It was a cracked enigma transmission that allowed the brits
To realize where bismarck was headed. Without the poles providing
Enigma, bismarck probably escapes.
They also saved Britain during “The Battle of Britain”
“Repeat Please”
https://www.youtube.com/watch?v=yXf1bhEEXd0