User blog comment:Master Sima Yi/Assassinews 19-03-'14 – Two Assassin's Creeds for 2014?: Unity and Comet/@comment-5311938-20140326150208/@comment-4055238-20140327004554

Bells could refer to:

AC1's intro trailer's church bells

AC3's fort bells

AC4's plantation bells

Not sure which one you're referring to, Kid, or if you had something else in mind.