You'll have to give more details -- characters' names, details of the story, or some such help so we have half a chance of identifying this book. Did you read it when you were ten or a teen or 35? Is it a kids' book or adult book? Do you remember photos or drawings in it? Was the author a male or female? Was it written from the British point of view?

We need more information.

Sure. Sorry! I am 45 and must have read it in the ages between 8/9 and 13, I think. It was set in WW2 London and was about two rival gangs of boys who played in the rubble of the bombsites (they were from poor areas I think). Eventually the two gangs combine to help foil a gang of criminals. I thought it was called "The Something Something" Wars, but can't be sure. I was hoping to find it for my son (and a little bit for me as well!).