The Grounder army is assembled outside of Mount Weather.

Clarke takes the lead as the Grounder warriors await the order to attack.

Lincoln may have fought an internal battle this season against the Reaper drug, but now he is preparing to take on the Mountain Men.

Echo is out of her cage and ready to fight for her people when the battle begins.

Lincoln contemplates the difficult battle ahead of him.

Bellamy unlocks the cages that hold the Grounder prisoners.

The only thing standing between the Grounder/Sky People army and the Mountain Men is a set of doors.

Mount Weather is home to many priceless works of art, and we think Bellamy fits right in.

The time has almost come for the battle to begin. We can barely take the suspense.

Another casualty only further proves what we already know – the Mountain Men need to be stopped.

Clarke has been preparing for the Mount Weather war, and her plans are finally coming to fruition.

Recent events are taking a toll on Jasper, Maya and Bellamy, as unfortunate circumstances provide a road block.

Clarke and Lincoln stand ready for battle, but getting inside the mountain is the first step.

Jasper and Bellamy are on high alert as they make their way through Mount Weather.

Bellamy, Jasper, Monty and Maya are making their way through Mount Weather, but what they find may be too much to bear.

Lexa let her emotions show recently, but this will not stop her from being the brave, badass warrior that we know and love.

Bellamy promised Echo that he would come back for her, and he is nothing if not a man of his word.

The Grounder army is on the threshold of Mount Weather and the doors must come down.

Echo is out of her cage and ready to join the fight against the people that put her there.