Possible Clues:

• Attack forcefully from above
• Attack from above
• Attack from the air while descending steeply
• Attack from a rapidly descending plane
• How to make flying raid on drinking den fail?
• Bib moved (anag.)
• Aerially attack target
• Attack from a steep angle
• Attack from the air? Abandoning bridgehead, I'd move to first bunker
• Strafe