Hidden Troop Traps

I could probably wrap this into another trap discussion, but there hasn't been one in a while. So....

One fun new trap might be to allow players the ability to hide their troops on the battlefield. For instance, since archers are largely useless, they may be useful if you could hide them as one of your traps in which you could send them out when an enemy unit is within range. The trap level could be upgraded to allow more troops to be hidden.

If you mix these traps in with other traps, then you will most likely catch some armies off guard.

Good idea, but not with certain troops (cats/cac)

I like it, but it would defeat the purpose of the battle.

To win you have to beat all the other player's units plus traps. If one set of units is hidden, that basically gives whoever has hidden units an automatic win because the opposing side can't attack it.

Also, you shouldn't be able to get by another player's units without killing them. How would this hidden troop idea work with that?