Assassin's Creed 2 Episode 19: Forlì Under Attack

"After Ezio's initiation into the Assassin Order, he was tasked to protect the Apple of Eden. His uncle and fellow Assassin, Mario Auditore, suggested he take it to the fortified city of Forlì since the countess, Caterina Sforza, was their ally."
"Upon entering Forlì, Ezio Auditore accompanied Caterina Sforza and Niccolò Machiavelli to Rocca di Ravaldino. Ezio had to fight his way through the city to reach Rocca di Ravaldino."
"Upon entering the Rocca di Ravaldino, Caterina Sforza was greeted by her children. However, she found out from a maid that two of them had gone missing in the chaos of battle."
"Having protected Forlì's castle from the attack, Ezio Auditore, Caterina Sforza and their allies awaited the Orsi brothers' next move."
"While Ezio Auditore was out rescuing Caterina Sforza's children, the Templars attacked the Rocca di Ravaldino for a second time, and Checco Orsi was successful in retrieving the Apple of Eden. Ezio then set out to kill Checco and retrieve the Piece of Eden."