UbiBlog now offers the E3 2015 multiplayer trailer from Rainbow Six Siege, the upcoming installment in the tactical shooter series. Here's the accompanying explanation:

One team defends, the other attacks. It’s a simple dynamic, but what Rainbow Six Siege’s multiplayer does with it is immediately, irresistibly compelling, as two squads of five counter-terrorist experts use every trick at their disposal to hamper, misdirect and destroy one another. Rainbow Six Siege’s matches are as open-ended as they are vicious, and you can get another glimpse of them in this trailer, unveiled today during Microsoft’s E3 2015 press conference.

Each of Siege’s multiplayer stages presents its own unique challenges – a fortified jetliner, for example, doesn’t offer as many entry points as a windowed building with skylights in its flat roof – and overcoming your enemies’ fortifications and traps is just as fun as laying them. If you’d like an early sample of Siege’s cerebral shootouts, you can sign up for the closed beta, which begins on September 24. Everyone else won’t have long to wait, however, as Rainbow Six Siege launches on October 13 for Xbox One, PlayStation 4 and PC.