"Forces Arm\u00E9es Neutralistes" . "Over 16,000 North Vietnamese" . . . . "advanced through northern Laos" . . . "Pyrrhic victoryforKingdom of Laos:North Vietnamese invasion repulsed;Royal Lao Armyseverely weakened, demoralized, and rendered largely ineffective" . "About 1,500 Pathet Lao" . . . "Pathet Lao" . . . . . . "Heavy" . "Campaign 139" . . . "1969-09-14" . . "5,000\u20146,000" . . "Campaign 139" . "Supported by:" . . . . "1970-04-25" . . . . "*24pxCIA" . "*24pxUSAF" .