Here is a brief plot summary of Henry VI Part 2:
Meanwhile, Richard, Duke of York, who has a tenuousclaim to the throne, schemes to make himself king.
The Earl of Suffolk is banished for his role in Gloucester’s death and killed by Walter the pirate, leaving Margaret without her mentor.
Meanwhile, Richard of York has managed to become commander of an army to suppress a revolt in Ireland. York enlists a former officer, Jack Cade, to lead a rebellion that threatens the whole kingdom, so that he can bring his army from Ireland into England and seize the throne.
As Cade’s rebels are routed, York, who has brought his army over on the pretext of protecting the King from Somerset, declares open war on the king, supported by his sons, Edward (the future King Edward IV) and Richard (the future King Richard II).
The English nobility now take sides, and the Battle of St Albans ensues. The Duke of Somerset is killed by the future Richard III. Young Lord Clifford, whose father has been killed by the Duke of York, vows revenge on the Yorkists, and allies himself with King Henry’s other supporters.