TAIPEI — About a four-minute walk from the metro station, Taiwanese troops slipped into the Tamsui River on an American-made M3 amphibious bridging vehicle, dropping pontoons and clusters of barrels rigged to explode.

On the shore, six retirees in gym slacks and tennis shoes were winding down their early morning Taichi, unaware that a group of main battle tanks — built with designs as old as they are — watched over the scene.

Taiwan deployed at least three CM-11 Brave Tiger tanks during the river drill that Friday morning, as part of the island’s 10-day annual Han Kuang exercise.

The Tamsui, about three-quarters of a mile wide, is vital to…

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