Here, in the "Thorn" restricted instance, the player is up against 38 fleets of Wiekes-III, each fleet has 13,500 ships stacked 1500x9 lead by Bruce. Player is allowed 20 fleets max. (Weapons and commander star rank to follow in later edit.)
Warning: Ships in this instance all have Extreme Counterattack, so each stack will inflict 1500*200=300k damage to attackers. Shield regeneration modules can help to counter this.