ACOUP has a pretty good piece on the practicality of planetary bombardments here: https://acoup.blog/2020/07/17/fireside-friday-july-17th-2020/ https://acoup.bl

ACOUP has a pretty good piece on the practicality of planetary bombardments here: https://acoup.blog/2020/07/17/fireside-friday-july-17th-2020/ https://acoup.blog/2020/07/17/fireside-friday-july-17th-2020... TLDR: Short of planet killing levels of power, you are unlikely to dislodge dug-in ground forces. Rock is really really good at absorbing impacts.