Class Notes 12/2

Wolf packs (groups of U-boats)
Atlantic, or Aim of Britain to keep shipping open
Royal Navy, or Royal Oak (British battleship sunk by a U-boat at Scapa Flow)

Allied convoys, or American aid
Torpedoes (used by U-boats to sink ships)

Submarines (U-boats), or Seeking/Sinking the Bismarck
Enigma (German coding machine; codes were broken by Allies)
Aircraft, or Air cover (limited by the "Black Gap")