How to research your family's WWI history
18 December 2013 Last updated at 06:23 GMT
World War One affected nearly everyone in Britain as men and boys were sent to fight in some of the toughest conditions.
One of the most interesting stories to come out of the conflict was the Christmas Truce, when German and British soldiers went into no mans land to shake hands, sing carols and play a football game.
Now children from the UK have travelled to Ypres to take part in a football game and find out what life was really like for the soldiers.
Martin travelled to Menin Gate in Ypres to ask Ian Coyne, tour manager there, how to trace your family history back to WWI.