Siege engines in field battles

[Didz]

How about a two stage delpoyment system for tebuchet bombarbment. The first tebuchet launches a carefully prepared cow skin filled with melted cheese which bursts over the Elephant coating it and its riders with its content. This is then quickly followed by a cage full of half-starved rats with an acid timing device intended to ensure that the lock on the door fails a couple of seconds after launch. The cage opens over the head of the Elephant spilling the starved rats onto it and its crew. E'voila an ancient guided weapon system for deployment against Elephant units.

Or if you think that is two far fetched.

How about the Hoplon Elephant Mine. A unit of Hoplites about to be attacked by elephants quickly rush forward and lay their hoplon on the ground, carefully slipping a small white mouse under it before running back to their ranks. The first Elephant to tread on the edge of a hoplon as it advances will cause it to flip or the opposite edge to lift releasing the mouse. As it shies away to avoid the small rodent it treads on more hoplons releasing more mice and creating a chain reaction leading to the total rout of the Elephants.