Possible Clues:

• 1941-45, for the United States
• Backdrop for some History Channel programming
• Tiny fellow enters Herts town -- no peace now
• Figure the waiter hovering round will give us no peace
• When it may be unsafe to travel
• When there may be censorship
• Eg, nineteen thirty nine to nineteen fourty five
• Send out the inexperienced for call-up in 1914, perhaps?
• Fighting then for a growth on I myself (7)
• Period of major fighting