Dunedain Counter-Invasions: Tôl Acharn is a Third Age: Total War submod that allow Dúnedain factions to unleash mighty counter-invasions against the Dark Lord, offensives known as Tôl Acharn - Vengeance Comes.
When a general, commanding an army sufficently large, accept to join a Tôl Acharn the units get a star on their unit cards, and the army get a star symbol above it on the strategy map.