Fledge, originally named Strawberry on Earth, was Frank the Cabby's horse. In 1900s London he drew a Hansom cab. He was accidentally magically transported from Earth into the Wood between the Worlds, along with Frank, Jadis, Uncle Andrew, Polly Plummer, and Digory Kirke, during Digory and Polly's effort to get Jadis off Earth. In the Wood, because he was thirsty, he wandered into the nearest pool of water, pulling the rest of the party with him in the cab. The pool was a portal to the newly created world of Narnia, and the whole party was teleported there. Thus Strawberry was the one who first (accidently) chose Narnia as a destination world, which began all the contact between Earth and Narnia.

During the creation of Narnia, Strawberry was chosen as one of the talking beasts by Aslan, giving him the power of speech. This allowed him to tell his former owner, Frank, how unpleasant his life as a cab horse had been. Strawberry lived the rest of his life free in Narnia.

Later on, to carry Digory and Polly on their quest to find a magical apple, Aslan again chose Strawberry for a special transformation, this time giving him wings and renaming him Fledge, the Father of all Flying Horses. The newly changed Fledge flew Digory and Polly into the Western Wilds of Narnia and eventually to the walled garden to pick a silver apple for Aslan, and then brought them back.

When the Seven Friends of Narnia came to Aslan's country, Fledge was there to greet them, crying to Digory and Polly, "What, cousins!"