More:Halo 3: Sierra 117

From GameWinners

Contents 1 Kill Arbiter 2 Monkeys with teddy bear 3 Hiding location

Kill Arbiter

Get a Needler and shoot the Arbiter until he explodes. The higher the difficulty, the more it will take to kill him.

Monkeys with teddy bear

After you come into contact with the snipers in the woods, follow along the left rock path. You will find a strange family of monkeys holding a teddy bear.
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This is a reference to the book The Summer Of Monkeys. When the boy puts the teddy bear down on the stump, the monkeys take it and hide in a forest.

Hiding location

When you are at the part where the two Pelicans get shot down, jump in the water. You will not die, which makes this a great hiding place for when your health is low. Do not go off the waterfall because the water at the bottom kills you as usual.