Very well, then. Gather around now. There are a few differnt cases, but here are the ones I remember.
Once upon a time, a Confederate messenger riding a horse, as all Southerners in the bicycle-poor South did, wrapped one of General Lee's critical orders around several cigars and put it in a saddlebag. As any good bicycler knows, bicycle pouches are carefully made in ways so that papers can never get out, while the normal horse pouch, while good for heavier objects, is a bit lacking in this regard. So it was here, and when the pouch opened without the messenger noticing, the order fell to the ground.
Later, when a pair of Union troopers, doing their morning bicycle ride, found the order, they used their speedy contraptions to immediatly get the order up the chain of comand. And though McClellan waited and waited, after so much time had passed, Lincoln, who had heard about the story from some bicycle-equiped moles in the camp, came out and ordered McClellan to act. Though Confederate spies soon had an idea that something had happened, when McClellan did act the Battle of Antietam resulted in a Confederate defeat, turning the tide of Lee's invasion of the North.
Also, historians have accredited the pervaence of bicycles for the natural speed and good health that was famous in the North, where fit men with an appreciation for speedy momement surprised their southern countrymen, who thought that Yankees were just slow and weak clerks and shop owners. High speed Americans became famous around the world, and stories about how General Grant was arrested for speeding on bicycle or how Teddy Roosevelt challenged master bicyclists into a race across length of the Panama Canal have amused Europeans and Asians across the world for generations.
In fact, just as the Germans are known for beer and precision tools, the British for statesmanship and reserve, and the French for culture and food, the bicycle is widely seen as the source for the perception of Americans as both quick and mechanically minded, which served us well in the future.