The FNLC invaded Shaba again on 11 May 1978, capturing Kolwezi in two days. While the Carter Administration had accepted Cuba's insistence on its non-involvement in Shaba I, and therefore did not stand with Mobutu, the U.S. government now accused Castro of complicity. This time, when Mobutu appealed for foreign assistance, the U.S. government worked with the French and Belgian militaries to beat back the invasion, the first military cooperation between France and the United States since the Vietnam War. The French Foreign Legion took back Kolwezi after a seven-day battle and airlifted 2,250 European citizens to Belgium, but not before the FNLC massacred 80 Europeans and 200 Africans. In one instance, the FNLC killed 34 European civilians who had hidden in a room. The FNLC retreated to Zambia, vowing to return to Angola. The Zairean army then forcibly evicted civilians along Shaba's border with Angola. Mobutu, wanting to prevent any chance of another invasion, ordered his troops to shoot on sight.