Envoy Placement and purposeful war

[Udey1]

(Apologies if this has already been discussed)

When a player declares war against a city state, envoys sent to that city state (or earned for free) are withdrawn and enter the pool of available envoys, right?

I think this is pretty crucial to smart management of envoys and quick status gains.. Has anyone experimented with this at length - used war declarations against city states to actively stack envoys with city states more beneficial to your empire/strategy?

 

[Nikae]

You lose those envoys permanently upon declaring war.