English to Chinese Social Sciences Military / Defense

When Tet began, Hue was defended by South Vietnamese Army units who were quickly driven from the city. The 101st and the 1st Cavalry were sent in to recapture the city. The battle for Hue raged for three weeks and was the only extended urban combat of the war. Later, the 5th Marine Regiment would be called in to reinforce the 101st and 1st Cavalry.
试译：
新春攻势开始时，防守顺化的是南越军队，不过很快被北越军赶出城外。第101空降师和第1骑兵师被派去重新夺取顺化城。顺化之战持续了3周，这是越战中唯一时间最长（？？）的城市战。后来，第5海军陆战团被调来增援。