Riddle MeThis - Rules Quiz Episode IV

The setup:
You have control of an eldar seer council on jetbikes.  There are 3 warlocks and a single farseer remaining in your unit.  Your enemy is a unit of ork shootas that has taken up a defensive position deep within a wood piece of terrain.  The orks are a total of 15” from the front of your unit.

The situation:
The orks are standing on the last objective that the opposing player is controlling.  You need to remove them from the objective to win the game.  At the start of your turn you manage to cast fortune on your unit of jetbikes.  You must now move through the difficult terrain and would like to assault through what is left of it

The riddle:
What are all the checks you must take for the above situation to happen?