According to
this Royal Navy Marines were recently engaged in a shootout with pirates were stupid enough to shoot at them (Russia may also have been involved). Also:
- The Indian Navy around Somalia may be using a different RoE than Western navies involved.
- An older post (I didn't see it on the front page and didn't dig for it) has a merchant captain's account of coming under attack by pirates and a NATO P-3 dropping ordinance on them.
PD