Assuming the crew of the gun fled, should count as a hit on the gun; otherwise a retreat not possible.
Coastal guns can't retreat, but the "retreat" against air attack is not implemented (i.e. it should be renamed, but the units don't actually retreat...real retreat only occurs when enemy land forces are present)
Coastal guns can't retreat, but the "retreat" against air attack is not implemented (i.e. it should be renamed, but the units don't actually retreat...real retreat only occurs when enemy land forces are present)