I want to know the answer to the following question:
Submarines and naval aircraft damaged what primarily?
All the background I'm provided with is that "Erich Raeder—commander-in-chief of the Kriegsmarine—had long argued the Luftwaffe should support the German submarine force (U-Bootwaffe) in the Battle of the Atlantic by attacking shipping in the Atlantic Ocean and attacking British ports.". Is that enough to answer the question?