Attack on Titan Part 2: Jiyuu no Tsubasa is the second compilation movie, that compiles episodes 14-25 of the first TV anime; i.e., from the end of the first compilation movie until the point where the first season of the anime ended. It was released on June 27, 2015 in theaters across Japan. It was rebroadcast on January 3, 2017 on MBS.
Overview: In the second compilation movie, episodes 14-25 of the anime are retold, retelling three story arcs: the Eve of the Counterattack arc, The 57th Exterior Scouting Mission arc, and the Assault on Stohess arc.
Summary: In a world overrun by Titans, humankind has been forced to flee behind three concentric Walls in order to stay alive. However, the safety provided by these Walls was destroyed the day the Colossal Titan appeared, and breached Wall Maria. Eren Jaeger, a boy whose mother perished on that day, joined the military in order to take his revenge against the Titans who had stolen his freedom and destroyed his home.
Source: Attack on Titan Part 2: Jiyuu no Tsubasa, available under CC BY-SA 3.0.