Toyota's Camry had been losing U.S. market share in a big way, but that suddenly changed in August. Photo credit: Toyota

Toyota's (NYSE:TM) Camry has been the best-selling car in America for a while now, but 2013 hasn't been its year. Through the first half of the year, Camry sales were actually down almost 3%. Fresh rivals from Ford (NYSE:F), Honda (NYSE:HMC), and Nissan (NASDAQOTH:NSANY) looked to be eating Toyota's lunch.

But suddenly in August, Camry sales were up almost 22%. What changed? The answer turns out to be pretty simple: Toyota resorted to one of the oldest tricks in the auto business. In this video, Motley Fool contributor John Rosevear looks at Toyota's new determination to "defend" the Camry -- and at what that's likely to mean for Ford and Toyota's other rivals.

Fool contributor John Rosevear owns shares of Ford. You can connect with him on Twitter at @jrosevear. The Motley Fool recommends Ford. The Motley Fool owns shares of Ford. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.