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It seems that in this season , that the speed of the orcs and goblins of the misty mountain was without peer , as they rushed against the walls of helms deep pushing the defenders under the command of Erkenbrand away from the dike , which couldn't be held against such numbers. Forced back to the walls, the civilians were rushed into the caverns behind the ancient fortress whilst the defenders patrolled the walls against the siege that assailed them.
Isengard had promised to move south to mirror there attack , and moved within range of supporting the attack on helms deep , if the orcs of the misty mountain wished to wait , but they might have other matters to deal with , as the dwarfven rhunnic alliance now threatened their eastern borders , so they might have to reallocate their forces and leave earlier, and might wish to hurry the attack. Some of the dunlendings left the main army wishing to revisit there wife's and families to the east, and the small party smashed into a rohan scouting party that was heading southwards near some of the woods.
Unfortunately for the troops of rohan , in the closeness of the trees , with its uncertain ground , the scouts on horseback couldn't use there speed to get clear, and the veteran dunlending warriors charged out with shield and axe felling many of the riders, cutting many down before they could get clear.
One uruk who had sneaked away with the dunlendings proved himself in battle diving headlong into the rohan forces, bringing down over ten of the mighty men , killing the last with his iron shield battering the last opponent to death...for this act, he was given a position of power from the dunlendings who admired his prowness in battle.
The accompanying rohan archer group began to panic against the sudden attack , with some of there more experienced archers letting off a rapid stream of arrows , bring down a few of the dunlendings, but wounding more than a score , before the heavy set armoured warriors, broke into there lines , with gusto swinging there axes left and right , felling many of the lightly armoured archers, before the unit disintegrated as people more feared for their lives than worry about army cohension.
This just left rohan with control of the far western lands [2 provinces] and the far upper northwestern lands [3 provinces] near tharbad and the missing army of its leader, which secured that area as well as the besieged helms deep.
Turn to Orcs of misty mountain
https://www.dropbox.com/s/hr9k04cyip..._M_29.sav?dl=0