The Chūnin Exam Stage 2: The Forest of Death

is episode 27 of the original Naruto anime.

Synopsis
Anko briefs the candidates on their goal for the second portion of the exam. All teams will be given one scroll (either heaven or earth), with the objective being to take the other scroll from another team and proceed to the tower in the centre of the Forest of Death and the next stage of the exams. The proctor, Anko, hands out scrolls and opens the forest gates. As they enter, Naruto's team is attacked almost immediately.