Warcraft III: Reign of Chaos/The Long March

Two days later, upon the desolate plains of the Barrens....

Mission Objectives

 * Main Quest - Three Oases
 * Lead the caravan to the first oasis
 * Lead the caravan to the second oasis
 * Lead the caravan to the third oasis
 * Thrall, Cairne and the caravan must survive

Strategy
Start off by taking Thrall's forces eastward. Carine's caravan will automatically follow Thrall, so there is no need to worry about controlling two different platoons...yet! Just make sure not to wander too far off, because the caravan will get randomly attacked from behind. You will meet some resistance while heading east until you reach the the bend which splits off to the west. Here there are quite a few marauders, so make use of Thrall's Chain Lightning attack. Continue around the bend and follow the west path until you reach the first Oasis. Here you can rest up and restore your squad's health. You also get three more Grunts.

After healing your forces to full strength, head north east a bit from the first Oasis. You can choose to fight some murlocs up north and gain some experience points or continue eastward. While moving east you will find some boxes with two marauders guarding them. One of them will contain a mana potion, so pick it up if you need it and continue to move east. After reaching the end of this path, go north until you see some kodos to the east and the west path. You can choose to fight the kodos to get claws of attack +3, but they do hit your forces pretty hard. Put up a healing ward and take them down as fast as you can. After picking up the claw of attack +3, continue by heading west. When you reach the Goblin Merchant, you will notice the intensity of the marauder attacks increasing. Ensure you constantly check the health of your troops. From the merchant shop, head north until you are able to travel northeast towards the second Oasis. Rest your troops here and you'll obtain a few Catapults.

Continue by heading east from the Oasis. Keybind the siege weapons and your troops. You can do this by selecting just the siege weapons and press Ctrl1. Select Thrall and his troops without the siege weapons and press Ctrl2. Now you can easily alternate between the two without having to mouse over them. Soon you will see two towers and a few centaurs. Drag the centaurs out away from the tower, bring up your catapults and destroy the two towers, then make sure the siege weapons are not taking damage. There will be a tower north on the right side from the first set of towers and another one north leading to a small centaur camp. There you can find the Pendant of Energy, which gives the hero 150 extra mana. If you want the Pendant of Energy, you will have to fight a hero centaur who has an AOE (area of effect) stun and will resurrect when you kill him the first time. Take out the other centaur that is with him first, then take the hero out. Just make sure to use your healing wards. Also, have some of your siege weapons attack the hero and this fight will be a breeze. After picking up your Pendant, head west and follow the path, taking out towers along the way until you reach the third Oasis.