This reminds me a bit of the invention of "chaff", which the British and Germans invented independently. Each side held back on using it because they didn't wa

This reminds me a bit of the invention of "chaff", which the British and Germans invented independently. Each side held back on using it because they didn't want to tip the other side off. It's curious to think what would have happened if one side or the other had discovered that their opponent knew about it too.