During WWI, there was a bridge connecting Germany and Switzerland. Nobody from Germany was allowed to enter Switzerland, and nobody from Switzerland was allowed to cross to Germany. A guard comes out of his tower every 3 minutes to see if anyone was trying to cross the bridge. If he saw anyone, he told them to go back. A woman in switzerland desperately needed to get to Germany, but knew it would take her at least 6 minutes to cross. But she managed it fine. How?