I'm fairly certain that I saw a post on here going into detail about the life of a Chinese siege engineer a while back but my searching through archived posts has turned up nada so I'm hoping someone might be able to point me to the right thread, or just answer me anew.

Basically as the title says, what was life, (esp. training, equipment, deployment, and compensation) like for a Ming-era siege engineer in the Chinese military? Especially around the late 1500s?