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The scenario begins with an intro movie/interactive timed area. The Orcs infest a large area of the map, but are removed forceably from the left half of the map. During this small interlude it may be possible to "save" a few workers, but it may or may not be energy well spent. Divide the map into a left half (hostile) and a right half (neutral/friendly.)
You are left with inhabiting the right side of the map (southeast and east-lower). This area includes a basic amount of infrastructure and a small gold mine. There is another gold mine nearby. The south has a ford that should be guarded urgently. Central-lower has a ford that should also be guarded urgently.
The upper east section has a few Owlbears (Furbolgs?), for two encounters of three each and a Gnome shop. Heading northeast leads to a ford, a jump gate to the northwest, and combat with a Pyromancer.
The north includes the Magic Fountain, a major plot element. The fountain is protected. The upper west (blue), lower west (green), and southwest (grey) are infested by Night Elves, and Cenarius. Green is the source of the Chimera. The Night Elves periodically send forays of Footmen, Riflemen, and Arrowpults across the fords.
Periodically Chimera and Hippogrif Riders fly across the rivers, primarily at fords, although not exclusively.
Using the cheats keysersoze and iseedeadpeople, and fortifying with an obscene number of Arrow Towers will lead to a stable border. However, the Dragons/Chimera mean that the towers need to be along the river in a depth of two or three, and among the infrastructure, in case the Chimera have a "breakthrough." Shamans and Trolls can engage, but are ineffective.
Bulk attack (Hero+Max flunkies) against the upper west in two or three pushes leads to a victory in that area, which contains a gold mine. This area is subject to random flyovers by Chimera, etc., and is difficult to secure. Any successful (major) attack on a camp will result in the appearance of Cenaurus.
Area 8 gets attacked very quickly. Before the attack on this is over, area 7 will also be attacked.
Order seven peasants, and initial upgrades to the Blacksmith shop. Use two of the additional peasants to mine for gold - three is the sweet spot for mining, but you will need the peasants for building towers instead. Use the first four additional peasants to create Arrow Towers on the lower ford. When a peasant completes his tower, move him to the upper ford to build towers. About three towers will be completed when the attack begins. Move your (few) troops in to the ford to reinforce. The towers will largely be destroyed in the initial attack. Be prepared to move your troops toward the upper ford as early as possible.
Put a few Arrow Towers or troops on each ford, against the initial attack, then reinforce.
Straightforward, just use your Hero and a small party. Use Wolves and Trees (peasants to hack them, or catapults to destroy them).