[yutyut]

This post prompted me to google "last time trebuchet used in combat".

The answer appears to be 2013/14 by Syrian Rebels fighting against the Syrian Army.

https://www.quora.com/Warfare-When-was-the-last-time-a-catap...

[alg_fun]

There was also a trebuchet appearance during Ukranian riots in 2014: https://www.youtube.com/watch?v=IEY4WG7P0NQ