When members of the royal family fall out, there can be consequences for the future of the monarchy and the country as a whole. The monarchy has been rocked by scandalous love affairs, fallouts, arguments and bitter disputes both past and present and weathered the dramatic events of what the Queen would call her, 'annus horribilis'. Using rarely-seen archive alongside interviews with leading royal experts, Royals at War will examine all kinds of royal rifts and tiffs. We get the inside knowledge from the best royal correspondents in the country, as well as those who were there themselves and witnessed the fall outs first hand. Renowned royal biographer Penny Junor - author of 'The Duchess: The Untold Story' - sheds light on the rumoured conflict between the Duchess of Cornwall and the Queen claiming that at one stage, "if the Queen could have opened up a large hole and put Camilla into it, it would have been perfect as far as she was concerned." We go back in time and look at one of the most famous royal scandals of the 20th century - when Princess Margaret wanted to marry the divorcee Peter Townsend - which caused consternation within the Windsors. As well as looking at the less well known squabbles - such as former Duchess of York - Sarah Ferguson, butting heads with the Queen's husband, Prince Philip. As royal correspondent for Vanity Fair, Katie Nicholl explains, "the Duke of Edinburgh never forgave Sarah for the embarrassment and the humiliation that she had reaped."