I would assume that the troops are being sent to operate the flood gates manually to reduce the pressure on the damn. With all of the powered equipment down they are probably going to be forced to rig something to open the gates, or start siphoning off the water.
Fixing the dam is going to require heavy equipment that is probably tied up at the Three Gorges project. It will probably come down on barges with a city worth of concrete.
Relieving pressure at a reasonable rate is the logical step at this point.
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