The fort is a prefabricated structure setup by the Marines upon arrival on a planet. It becomes their base of operations. It has a walkway on the walls from which Marines can fire, and which counts as cover. The walls have a defence rating of 10, and the gateway has a defence rating of 8. The gate can be opened/closed in the Human’s movement phase (it is remote controlled, so nobody has to be near it), but it takes a full turn to do this (i.e. open it now, you will be able to walk through it in your next turn), you can move troops through it and close it in the same turn, but it will not act as a barrier until the beginning of your next turn.
Assaulting the Fort
A human on the walls of the fort is at a huge advantage over a bug at the base of the walls, but those bugs can jump! If a bug reaches the base of the wall, it must fight a combat to scale the wall, receiving no modifiers. If there is no human guarding this part of the wall, the wall ‘fights’ with a +1 modifier. If there is a human at the same point of the wall, he can make things difficult for the bug, so fights the other side of the combat, gaining a +2 modifier in addition to any he already has. A bug success in combat means the bug model is placed on the walkway of the wall. A Human success means he rolls on the bug’s damage table. Multiple humans can gang up on one bug trying to climb/jump, but multipile bugs cannot gang up on the wall (you can’t work together to distract a wall!)