ニンビン
In November 1883 the French further strengthened their grip on the Delta by occupying the towns of Ninh Bình, Hưng Yên and Quảng Yên. The allegiance of Ninh Bình was of particular importance to the French, as artillery mounted in its lofty citadel controlled river traffic to the Gulf of Tonkin. Although the Vietnamese governor of Ninh Bình had made no attempt to hinder the passage of the expedition launched by Henri Rivière in March 1883 to capture Nam Định, he was known to be hostile towards the French. Accordingly, Lieutenant-Colonel Pierre de Badens (1847–97) was sent to occupy Ninh Bình with a company of marine infantry, supported by the gunboats "Léopard" and "Pluvier". Cowed by the silent menace of the gunboats, the Vietnamese handed over the citadel of Ninh Bình without resistance, and the French installed a garrison there.