Admiral Ackbar t5 challenge

I've done it not long time ago. I need to say, this challenge it is only RNG, it doesn't matter what ships you are use, or how strong they are, it is only RNG. I've tried dozen times and suddenly some day I've done it, that time Endurance didn't call for reinforcments just spamming with basic attack. Mine ships were quite weak : 5* Ashoka G8, Wedge & Biggs 7* G11 both, 6* Phoenix ships with G8, JC 5* G8, Cassian's ship 6* G7
Tactic was take off first Ashoka, Rex, JC and then one by one Clones Sergs.