Help with WvW?

I am not familiar with the Guardian spells used to protect the folks building and operateing the Flame Rams.  If someone could post about the skills available to protect these Flame Rams, with their use and mechanics (what can be expected) .... I would be forever grateful.

Also if a mesmer, that is familiar with hiding areas, could document the locations with screenshots and guides, not only could we get the information out, but we would know where to look for the enemy.

The big one for Flame rams is Hallowed ground because it provides AoE Stability which prevents a catapult build behind the door form constantly knocking down the ram drivers.