This week we take a look at how the war between union and league played out in the UK during World Wars 1 and 2 - with union’s league ban lifted, league stars shone in union. But it still wasn't a level playing field, as the Welsh league player forced to play for the England rugby union side discovered. And when the world war was over, the rugby war resumed with a vengeance. For more on the history of rugby and the other football codes, follow me on Twitter @collinstony and at www.rugbyreloaded.com