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. Thrall 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 the caravan reach the first Oasis. Here you can rest up and restore the caravan's health. Three more Grunts appear to join Thrall.

After healing Thrall's forces to full strength, head north east a bit from the first Oasis. Thrall can choose to fight some Murlocs up north and gain some experience points or continue eastward. While moving east Thrall will find some boxes with two marauders guarding them. One of them will contain a mana potion, so pick it up if Thrall needs it and continue to move east. After reaching the end of this path, go north until some Kodos are spotted to the east and a separate west path. Thrall can choose to fight the Kodos to get claws of attack +3, but they do hit Thrall's forces pretty hard. Put up a healing ward and take them down as quick as possible. After picking up the claw of attack +3, continue by heading west. When the caravan reaches the Goblin Merchant, the caravan will suffer more frequent attacks of the marauders. Ensure the health of Thrall's troops is in good shape, if not use a Healing Ward. From the merchant shop, head north until Thrall is able to travel northeast towards the second Oasis. Rest Thrall's troops here and obtain a few Catapults.

Continue by heading east from the Oasis. Keybind the siege weapons and troops. This can be done by selecting just the siege weapons and press Ctrl1. Select Thrall and his troops without the siege weapons and press Ctrl2. Now it's easier to alternate between the two teams without having to mouse over them. Soon Thrall will see two towers and a few centaurs. Drag the centaurs out away from the tower, bring up the catapults and destroy the two towers, make sure the siege weapons aren't 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 Thrall wants the Pendant of Energy, Thrall and his troops will have to fight a hero centaur who has an AOE (area of effect) stun and will resurrect when he is killed the first time. Take out the other centaur that is with him first, then take the hero out. Just make sure to use healing wards. Also, have some of the siege weapons attack the hero and this fight will be a breeze. After picking up the Pendant, head west and follow the path, taking out towers along the way until you reach the third Oasis.

With the caravan at the third Oasis the battle is won.