Destroying a bridge might look easy in the movies, but remember: They're designed to withstand the immense shear-forces of wind and weather. Deploying an underwater M-32 satchel charge at the base of each load-bearing pylon looks like the answer, but it might not even shake a modern riveted steel highway or railroad bridge. Without delving into the complex language of the guerrilla combat engineer, the best advice I can give you is to forgo subtlety in favor of brute force: Put two satchel charges at each X-shaped trestle buck, and this should rob the bridge of any reinforcing strength and cause it to buckle nicely.
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