On December 7, 1914, Pope Benedict XV suggested a temporary hiatus of the war for the celebration of Christmas. The warring countries refused to create any official cease-fire, but on Christmas the soldiers in the trenches declared their own unofficial truce.
The name of the device is the <span>Fessenden oscillator. It was made to allow submarines to communicate through Morse code. This way they could avoid communication being intercepted.</span>
