Possible Clues:

• Show about monks who form a rock group?
• HBO WWII miniseries
• HBO miniseries on WWII
• 2001 Spielberg WWII miniseries, and what 20-, 32- or 41-Across is
• 2001 WWII miniseries
• 'We few, we happy few, we - - ' (King Henry V)