Stronghold Glitch Cheat

Supposedly there is a glitch cheat that only works with snake map, but I am assuming it works with all default stronghold maps. The cheat works only if your ice and you have to build an engineer to dig an enemy moat only if he spent over 5k building it. You have him dig and it supposed to burn his entire moat but it kills all of your soldiers as well. I am going to try this cheat in the near future, but really who builds over 5k of moats in the snake map? Well please, someone try this and comment if this works or not, I am going to try it and film it in the near future.