Tell me some of the creatures that were part of the Narnian’s army?  

There were great cats in Narnia’s army, cats were leopards, panthers and the like. The giants were also taking part in the battle. 

How was the Hermit able to know what was happening in the battle at Anvard?  

Through the smooth pool beneath the spreading tree. The Hermit looked the pool to know what was going on in the world outside the green walls of his hermitage. The magic pool as a mirror, only he could see what happened outside.

How was Prince Rabadash captured at the castle?

The poor Prince Rabadash be captured because he was suspended from the castle wall.  The story was this: The Prince Rabadash wore the chain mail, but the giant’s spiked boot tore a hole in the back of his hauberk. When he was fighting with King Edmund near and near the wall, he jumped from a mounting block sideways, the hole in the back of his hauberk caught on a hook in the wall.  Thus he was hang on the wall.