War of Deliverance

You may be looking for the Winter Revolution.

The Narnian Revolution (also called the Narnian Civil War, or more formally, the War of Deliverance) was a civil war in Narnian year 2303 fought between the "Telmarine-Narnians" and the "Old Narnians" (mainly Talking beasts).

Origins
For nearly three hundred Narnian-years, the Telmarine Dynasty reigned unchallenged over the conquered country of Narnia. When Miraz killed his brother King Caspian IX in 2290, he usurped the throne but left Caspian's son, Caspian X, alive as his heir in case he had no children himself and needed a successor.

As an older boy, Caspian X encountered a tutor named Doctor Cornelius who told him of Narnia's past and how the Telmarines were not the rightful rulers, but had reigned for dozens of decades, practically driving out Narnia's old inhabitants and natives. Around the time of Cornelius's appearance, Miraz's wife at last bore them a son and Cornelius warned Caspian that he must flee or be killed like his father now that his evil uncle Miraz had a child of his own.

Caspian escaped from the palace and soon was confronted in the forests by the fabled Talking Beasts who had been ousted from Narnia during the Telmarine Conquest. Although a Telmarine descendant himself, Caspian showed how he saw his ancestors wrongs and the group of outcast beasts, the "Old Narnians", accepted him. They even declared how he would be their king if they could defeat the Telmarine-Narnians in a rebellion against their reign.

The Revolution
At once, Old Narnians, all of whom had been in hiding, appeared to join Caspian's gradually growing army. Miraz quickly heard of the uprising and his army was soon on the move. The Old Narnian Army made camp at Aslan's How where they twice met defeat by Miraz's soldiers at the First and Second Battles of Aslan's How.

Caspian then called upon the ancient Narnian kings and queens Peter, Edmund, Susan, and Lucy to aide in his seemingly hopeless war. At first arrival, Peter and Edmund showed their abilities by preventing an assassination attempt on Caspian which also helped sort out the traitors among the Old Narnians.

Without a large enough army, Peter suggested that he duel Miraz one-on-one rather than continue the civil war. Later, Miraz accepted Peter's challenge and when they fought, a slip-up on Miraz's part was declared to be an illegal move by Peter. In the angry charge that followed from the debate from both armies who were watching the duel, Miraz was quietly stabbed dead by none other than one of his own noblemen, Glozelle, and this final, major battle led to the Fords of Beruna where the Telmarines were trapped and forced to surrender, so that Caspian was made King of Narnia.

Important Events

 * First Battle of Aslan's How
 * Second Battle of Aslan's How
 * Assassination Attempt on Caspian X
 * Telmarine Castle Night Raid (Movie only)
 * Duel of Aslan's How/Second Battle of Beruna