In 1470, Henry VIth was released by Warwick from the Tower, and re-established as the rightful king of England. The Usurper Edward IV was banished forever. Sadly for the Lancastrians, Edward IV was determined to reclaim the throne when he landed at Ravenspur in 1471.
The Campaign of 1471
Here are some handy maps to help you navigate through the events of the year. They constitute plot spoilers, though!