During a war named after this region, the Fuzhou (“foo-joh”) Arsenal was ironically destroyed by the country which had largely funded it. This region lends its name to a flotilla and a tirailleur (“tee-rye-YURR”) rifle regiment that fought (-5[1])during a war that culminated in the Battle of Paper Bridge against the Black Flag Army. (10[1]-5[1])A “Pacification” of this (-5[1])sub-national region suppressed the “Save the King” (-5[1])movement, (-5[1])which attempted to place (-5[1])the boy Ham Nghi (“hahm nee”) on the throne. (-5[3])Until 1948, Annam and a French protectorate with this (10[1])name (10[1])were nominally (10[1])governed by the Nguyễn dynasty. This name (10[1])is shared by an exonym for northern Vietnam, a former name of Hanoi, (-5[1])and an inlet (-5[1])where, in 1964, (10[2])torpedoes (10[1])supposedly (10[2])fired on the USS Turner Joy and Maddox. For 10 points, U.S. involvement in the Vietnam War increased after an “incident” (10[1])in a “gulf” named after what (10[4])word? (10[1])■END■ (10[5])