This Warcraft 3: Reign of Chaos walkthrough is divided into 31 total pages.
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Orc 5: The Hunter of Shadows
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This one can be a bit hard. You start off with 4 bases.
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But three of them get attacked and destroyed right away. I suggest you take all of the peons you have in the three western bases and move them to the southeastern one.
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Start researching nets and make 3 raiders.
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You could also make a few additional towers, but it's not required.
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Start troll regen, make a few headhunters then upgrade the grunt's health and make 2-3 grunts.
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Also, start upgrading the witch doctors ASAP. Their master upgrade allows you to put up healing wards, which is the first heal you get within the orc missions.
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Goal of this mission is to kill Cenarius, which is impossible at this point as he has Divine type armor, which means you can't deal damage to him.
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After the witch doctor upgrades, get the shaman ones. The masters shaman one allows you to use Bloodlust, which increases attack speed by a lot.
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After the night elves have finished with your 3 bases, they will attack your main one head on.
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It might be hard with so many flying units, but use the raiders and the healing wards and you should do it easily.
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Start upgrades after all that fuzz.
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Start an expansion to the north. Should be fairly easy to defend, especially if you build a few towers.
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Build 2 catapults when you can.
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Also, you will want to have ~3 shamans and 3 witch doctors. The healing and bloodlust are invaluable.
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Make second barracks and when you have ~50 supply you'll be ready to move out.
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Leave a few forces in your base and start building more ASAP, since you want to protect your base while your main army is away.
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You will want to go north with your main army.
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When you reach the trees over here, destroy them with your catapults.
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Just continue forward with your main army. You will find a portal and satyrs in your way, should be easy enough destroying them.
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You will reach a red fountain protected by a few satyrs.
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After you kill the satyrs...
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...your orcs will be transformed into fel orcs. Now you deal Chaos damage with attacks, allowing you to attack cenarius without any issues.
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After your forces are back to your base and (assuming you've been building more units) you can attack straight away.
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I chose to attack the south base for no reason, you can attack the north one if you want to.
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After destroying the base, Cenarius will arive with a few units.
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Killing him should be easy enough.
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After you've killed him, you will complete the mission.
More Warcraft 3: Reign of Chaos Walkthroughs
This Warcraft 3: Reign of Chaos walkthrough is divided into 31 total pages.