Just played as Rebels and managed to win this one against a very experienced Imperial player (playing subversive deck). Thought I share some insight as to how to do it. It contains spoilers of the mission. I didn´t know anything about the mission beforehand. Its all from memory, so some parts might be incorrect. My team consisted of Jynn, Diala, Fenn and Gideon. With master of command on gideon (three uses of command at cost of 4 strain) and being able to get a player focused when declaring attack (thus, 5 strain), simply started by letting Fenn (all blasted up including reward from his side mission),kill of the royal cards and get some blast dmg on the door (not enough to open it). Imperial activated the elite storms, but with starting position on jynn she refired and killed one of them and killed the other by quick draw. Jynn had by then (with extra movement points from being attacked/attacking) positioned herself close to the crate at the top room. Her activation was simply picking the crate and killing the last stormtrooper. Thus, Imp was basically out of units straight on. Turn 2 he used threat to mobilize a few new units. I had positioned fenn and diala close to one of the doors (the dmg one) since I didn´t know what to expect when they opened and wanted a clear fireing line. Weiss gets out, and he gets some dmg on fenn. But basically i get him down to 5 health with use of command and diala (removing one of his defensive dices). Seeming how quick i kill him, imp panics a bit (his only mistake) and use his deplete ability to roll for heal (healing him 5 hp). Turn 3, Weiss is still alive but on my first round i managed to kill of all remaining imps but one, forcing him to activate Weiss without any target ( i hid behind the walls). I then heal up on a few characters (he got the ability where he can interupt to attack, but since im out of range he can just move. At the end, he does, but tries to move away from me. Mid turn three, i manage to kill him off, spawning "my" at and some new imperial ones. I decide to quickly move forward, leaving the new spawned imps behind. This is where my main mistake take place. I get the crate just outside the "inner"-part of the map, and get a card where im able to see his reserve deck. I find Weiss in there again, and I get the idea in my head that my AT will be "taken over" by Weiss. So i keep running forward with the team, leaving the At behind. My main reasoning is that I might be able to fight off anything in there without the ATST, but I wont be able to fight with a ATST in my back killing Gideon. IMP conserves threat (sitting on 23) since the deploy area is back with my atst and the figures deployed would not be able to catch my people anyway. I, probably mid turn 5, use a strain move as first thing on Dialas activation to "activate" the outdoor stuff. (by this time, all of my team is close to fully healed. Jynn and Diala got about 5 dmg but no strain, Gideon one dmg no strain, and Fenn 2 strain), but gideon has already activated. Seeing everything spawn and the door close, I´m happy to have my whole team in position. Main problem is that i left the At far behind, now having to fight without it. I position Diala at the bot close to Weiss with a double move, while Fenn makes a double attack on the e-web elite, using the close proximity to Weiss to score 6 points of blast dmg on him while almost killing the e-web. E-web activates, jynn managed to stun it, leaving one attack aimed at her. She takes enough dmg to be wounded and having full strain (he uses ability where he converts some of dmg to strain). Weiss gets two attacks, scoring some hits on Fenn, who is close to be wounded (he got rebel elite so 15 hp). He then deploy for 23 threat, with the map simply overun by imp figures. I start turn 6 with Gideon commanding Fenn to fire 3 times, using all his strain to also letting him be focused for one of the shots.Fenn, despite being targeted by the imp ability where he gets -1 dmg and -1 defense, managed to injure Weiss to what is now a total of 17 points (9 hp left). The e-web dies from blast. IMP activates royal guards, killing jynn (/before she can activate) and succesfully managing to stun fenn. Weiss activation moves him further away from DIala, who has yet to activate. I activate Fenn, removes stun and get another 5 dmg points down on Weiss (now only 4 hp left), mainly thanks to 2 extra dmg from the trench fighter ability with Weiss now standing withing 3 spaces). His defensive rolls with Weiss is really bad. Weiss fires on Diala (probably a mistake), but I roll a clean defense and she gets focused. He then rushes Diala with elite royal guards, they fail to stun her (rolling bad again) but converts dmg into strain, having her fully strained and about 5 hp from wounded. I activate Diala, she uses the bacta pump (best item in game) to remove one strain (could have been a stun), reaches Weiss on 5 move (through royals with art of movement), rolls as focused (having her light saber and the attachment that gives one surge on exchaust). He rolls 4 defense, she rolls 5 dmg, i use the exhaust ability for the surge and use the pierce 3. 4 points of dmg and I win, having one straing left in case I´d had to reroll. The win is possible despite having "my" ATST not making a single attack. Close as hell, very difficult, needs some good dice, but doable. I think you need a lot of "extra moves" for you to get there. Gideon got 2 mp every time he uses command (usually two times per turn (4 mp) he heals first then command and master command), Fenn got tactical movement (+2 to him or friendly), Diala art of movement (5 move no constraints) and Jynn everything (3 moves in total if attacking and damaging, one move if shoot upon). All in all, it made me able to move forward quickly, and it really helped to be all healed up and at the "right side" of the door still having some activations left when triggering the final area. I never targeted anything but Weiss (well, the E-web, but that was just in order to get easier dmg by blast) and I had Gideon not wounded standing next to the door, 3 spaces away from Fenn. Leading up to the finale, we had won 12 xp each, with me winning more of the side missions ( i had rewards on fenn, jynn and diala). I also had better dice than the IMP-player in this scenario, but it wasn´t crazy, just slightly better overall. I also had good weapons on Jynn and Fenn, both rolling 3 dices in attack. Jynn had the dual pistol trait being able to use surge from two guns, thus having straing effects like pierce 2, dmg 2, dmg 1, etc. So, all in all, it felt impossible, but it was doable, despite leaving the At and the IMP-player playing well. Hope it works as encouragement.