Battle fought between a mixed human force and an Elvenhost from Sildor, over access to the Trakar for an elf invasion.
The humans - a mixture of Tellaran, Antroller, Orwinian, Sinvalese and Oreti troops - won against all the odds, forcing the elves to retreat and abandon their plans to exterminate the Lizardmen.
The Elven hero Galoriand refused to fight at Thallan, causing a rift between himself and his King which lasted until the Invasion.