Helm's Deep

When a movie or TV show tries to build up tension for a big battle by reiterating how hopeless a cause it is, and how much everyone's definitely going to die, until the viewer wants to scream GET TO THE DAMN FIGHT ALREADY. Named after the Battle of Helm's Deep in The Two Towers from the Lord of the Rings trilogy.
Extra points if it's a TV show that gives the audience blue balls by making them wait another week for the entire battle.

"Man, that Game of Thrones episode really built up the hopelessness of the battle to the point where I was annoyed, they totally Helm's Deeped us."