Image from the following article:

https://spectrum.ieee.org/telecom/security/the-real-story-of-stuxnet

Stuxnet, if you are not aware, was a worm created by ??someone?? and was designed to destroy centrifuges used in the Iranian nuclear program b making the displayed RPM not match the physical RPM so they would not notice the problem. It was said to be distributed by infecting random computers and USB in the city where it was needed, and waiting for a worker to walk it into the air gapped facilty and plug it in to use.

This was in 2010.

Some older examples of using cyberwar from this article:

https://isssource.com/stuxnet-loaded-by-iran-double-agents/

It is interesting to note Stuxnet was not the first virus used by the U.S. military intelligence to try and disable opponents. In the 1980s, the United States had considerable success at planting viruses inside Soviet military-industrial structure that could be activated in time of war, a process still continuing with China. “We put in bugs inside the Soviet computers to feed back satellite information that had been ‘leeched’ off hard drives, in the Soviet Defense Ministry and others,” said a former U.S. intelligence official.