A French court has thrown out a lawsuit by a French Vietnamese activist against over a dozen companies, including Dow Chemical and Monsanto, that produced and sold Agent Orange, which was used by the U.S. military during the Vietnam War. The case was brought by Tran To Nga, herself a victim of Agent Orange. She vowed to appeal the decision.

Tran To Nga: “The cause is just, because truth is on our side. It’s for justice, it’s for the truth, it’s for people more unfortunate than us, that we continue on.”

U.S. warplanes dumped about 18 million gallons of the poisonous chemical during the Vietnam War, leaving millions of people with disabilities and illnesses, including cancer, heart and birth defects.