Who can knock Germany off high horse?

Will either Britain or the United States finally be able to put an end to nearly 60 years of Olympic dominance?

Queen Elizabeth II will be following this Olympic event, maybe even in person. The same goes for US presidential contender Mitt Romney.

There will be plenty of eyes on the stands at Greenwich Park beginning this month, but there are several storylines to watch for the equestrian competition at the London Games - beginning with Germany's supremacy in dressage and show-jumping, which stretches back to 1956.