Glee may have made love this week, but enjoy the peace while you can, fans. The show is about to make war!

On next week's "Mash Off," look for Shelby to encourage a bit of competition between her squad and New Directions, which leads to a few insults and... a game of dodgeball?!? Yes, based on the following promo.

Also, expect movement on the inappropriate Pelpy (or Suck?) front, as also teased below; while the show will put on its 300th performance. Allow us to send along some hearty congratulations ahead of time...

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.