The idea for this gameplay feature comes from a mod called [[ https://wildfiregames.com/forum/topic/21390-metagamev2-mod-version-2 | MetaGameV2 Mod Version 2 ]] (22/Nov/16) made by `Eraser`, who wrote:
> [...] this mod more than a game it's a pool of concepts and ideas for the main game, using existing resources.
The basic idea is to give the `Spartan` civ a strong weapon to defend against cavalry attacks. The spike deals damage against cavalry units that get too close to it. Here are some short videos:
Attack from behind has no effect
Attack from the front causes damage
I only chose the `Spartans` to make the civ more unique. Could also be extended to other civs.