Eisenstein's film depicts this battle in a sequence that's one of the most famous in all of motion picture history. Set to the choral score of Sergei Prokofiev, it's an amazing piece of work that, like so much of Eisenstein's output, has proven extraordinarily influential on other movies. Likewise, Prokofiev's score, which is widely regarded as the best movie score ever composed -- and rightly so in my opinion -- has proven similarly influential, especially in genre films that feature pitched battles between the forces of good and evil.
Anyway, here's a clip of the Battle of the Ice, in case you've never seen it before. It's an impressive example of film making and a perfect marriage of image and sound to create a memorable viewing experience.