The eleventh mission in the Z.A.F.T '71' story path and a rather short one going up against the Dreadnought Gundam and it's escorts while fighting alongside a GuAIZ.
it can be difficult to go over this mission as it is just a straight up fight though the Dreadnought is quite a bit tougher than anything faced up to this point being far more durable and very capable of inflicting huge damage if it catches you, thinning out the escort units or taking them out when you can to keep both them in check and your meter charged makes it a fight that is oddly in your favour at least while either your partner ai or the GuAIZ are still active.
if you are using Physical weapons it should be noted the Dreadnought's Phase Shift Armour will recharge slowly over time letting it eat up more of your attacks, having at the least a decent beam weapon to close out the fight or the Penetrate skill ( 30% of physical damage ignores Phase Shift Armour) could be useful to prevent frustration.