public void Battle()
        {
            while (P1.Any() && P2.Any())
            {
                RoundsPlayed++;

                var c1 = P1.Dequeue();
                var c2 = P2.Dequeue();

                if (c1 > c2)
                {
                    P1.Enqueue(c1);
                    P1.Enqueue(c2);
                }
                else
                {
                    P2.Enqueue(c2);
                    P2.Enqueue(c1);
                }
            }

            P1Score = CalculateScore(P1);
            P2Score = CalculateScore(P2);
        }