public Tuple<Guid, Guid, Guid> AcceptChallenge(Guid challengeId)
{
//Get the challenge
var c = CloudWarsData.GetChallenge (challengeId );
//accept the challenge and create the match
CloudWarsData.AcceptChallenge(challengeId);
this.CreateMatch(c.Player1, c.Player2);
return new Tuple<Guid, Guid, Guid>(this.MatchId, c.Player1, c.Player2);
}