Yesterday, we gave you the chance to win books hand-picked by Osprey staff. Today, we're giving you the chance to win one of five i-pad Battlelines Pearl Harbor apps.

Featuring a unique bird's-eye-view map that plots the Japanese attack, the location of US ships and the heroic American defensive efforts, Pearl Harbor is an interactive, illustrated timeline of the infamous Japanese attack on Pearl Harbor in 1941.

The devastating surprise assault inflicted horrific casualties on the America forces stationed at the Hawaiian naval base, sinking or damaging 18 American ships and killing thousands of American military personnel.

This app provides a blow-by-blow account of the attack, using an interactive 3D map to track the Japanese attacks throughout the morning, the background to Japan's gamble to knock-out the American Pacific Fleet in one action, and its ultimate failure.


And we're giving five of these i-pad-only apps away! Of course, advent calendar's give you chocolates for the minimal effort of prizing open a cardboard door, so we though we'd give you a question of similar difficulty;

What was the Japanese call-sign to indicate that the attack was a complete surprise?

(Hint: it also features in the title of our book on the attack, but don't tell anyone I told you...)


So if you have a access to an i-pad, send your answers to [email protected] along with your name and 'Pearl Harbor' in the subject.

Good luck!