Battle of Hastings
Basically, the Normans won because of poor scheduling. Poor old Harold was required to put in an appearance at the Battle of Stamford Bridge, and then swiftly march south to meet the Normans in the much anticipated clash at Hastings, while the Danes had the bye. The effort of back to back matches was too much for the English, and as no-one on the organising committee could be found to protest, the Normans got to keep England. Had the English been able to avail themselves of the usual break between major battles they probably would have performed better, as it would have given more time for their injured stars to regain fitness. The Normans also had success in the Holy Lands and Sicilian Leagues against indifferent and confused opponents until the game's authorities (see also: Pope) intervened.