Was defending against the Russians on the Eastern Front in early 1943.
My left flank was hard pressed as the (AI Tank Heavy) force was pushing with KV's. T-34's, and assorted light tanks. To my front was a lake/river with two bridges crossing it. Not the only route to my left flank but the easiest and most direct one for the AI.
I was preparing to either reinforce or fall back when I remembered (after having read it here) that heavy arty can destroy bridges.
I called in a mission on each bridge not having a clear LOS on either. On my third shot the nearest bridge was hit and went down followed by a message that a KV-1 and T-26 were destroyed - presumably by falling into the river with the collapsing bridge!
How cool was that!