The Dragon's Jaw bridge at Thanh Hoa was the toughest target in North Vietnam. It was 540 feet long and crossed the Song Ma, a river 70 miles south of Hanoi. A railroad track ran down the middle, with a highway lane on either side. The bridge rested on a massive center pillar of reinforced concrete, 16 feet in diameter. The abutments were solidly anchored in the hills on both sides of the river.rnThis bridge was a replacement for the original one built by the French before World War II. Viet Minh insurgents managed to destroy the first bridge in 1945 by staging a collision in the center of it by two locomotives loaded with explosives. North Vietnamese leader Ho Chi Minh presided at the opening of the new-and stronger-bridge in 1964.
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机译：Thanh Hoa的Dragon's Jaw桥是北越最艰难的目标。它长540英尺，穿过河内以南70英里的河流松马。一条铁轨从中间滑落，两侧各有一条高速公路。这座桥座落在直径16英尺的钢筋混凝土大型中央支柱上。桥台牢固地锚定在河两岸的山丘上。这座桥是二战前法国人建造的原始桥的替代品。越明叛乱分子在1945年设法通过装满炸药的两辆机车在其中心发生碰撞而摧毁了第一座桥梁。越南北部领导人胡志明（Ho Chi Minh）于1964年主持了这座新桥和更坚固的桥梁的开幕仪式。
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