The first major Orcish Horde in Arnorian History flows down the neck, into Budan-Mar, as several Orc Clans band together under a charismatic leader in hopes of establishing safe rangelands for their people in the prosperous lands to the South.
This isn't the first that the Empire has seen of Orc's, as smaller migrations had been happening over the course of the last century or so, but it was the first of the larger violent hordes. General mobility and the fierceness of their warriors sees them to initial success, razing numerous villages and towns and even breaking through the walls of Neeron and laddening themselves with pillage.
...which is where the 7th Legion, out of Budan, found them..
Drunk, heavy with loot, and still "otherwise engaged," the Imperial Legion fell upon the Horde and almost finished the battle before it was over. None the less, the Horde managed to rally, one of the subordinate chieftans rallying his Clan and staging a brutal counterattack which allowed the rest of the warriors to regroup and turn the fight into a true battle.
In the end, however, the Horde scattered...
...and the legion, licking it wounds, wondered how poorly that would have gone if they hadn't crashed upon a distracted force that wasn't expecting battle.