Weapons, U-Boats, London Blitz, and Buzz Bombers in world war II.

First picture source: http://www.channel4.com/history/microsites/W/ww2weapons/images/homepic.gif

Second picture source: http://www.wreckhunter.net/images/u-boatnight1.JPG 

Third picture source:

http://static.howstuffworks.com/gif/nazi-germany-conquers-france-30.jpg 

Fourth picture source:

http://static.howstuffworks.com/gif/d-day-invasion-19.jpg