Parnu is a major city in Estonia. It was the site of a GDI mission to eradicate Kane's forces in the area. The errand was a total success for the newly-formed Global Defense Initiative during the First Tiberium War.
A GDI Commander (Tiberian Dawn) was briefed by Adam Locke (in the demo, James Soloman and Mark Jamison Sheppard to do this briefing) to go straight to Estonia under the orders of British Prime Minister Weatherell. Over there, the Commander used GDI's naval forces to quickly bombard Nod forces on the beach plus inside any civilian building or their military defenses. GDI's army landed on the beach and reached for the city, but are pinned down by enemy defenses along the coast. After efforts of pushing Nod back and capturing the beachhead, GDI oversaw its first victory against Kane.