|You, Alphinaud (And his newer Moonstone Carbuncle that casts Luminous Lance), and Yugiri Mistwalker will join several Confederate Lancers fighting three Imperial Eques and an Imperial Signifer. Deal with the Signifer first, but a Cermet Pile from a Magitek Rearguard nearby will soon hit all the lancers and draw them off to the bigger fight to the north where two more lancers and Tansui the foxed are facing the rearguard, two Imperail Hoplomachus, and three more Imperial Signifers. Take out the smaller adds as best you can, preferably with AoE attacks, before tackling the Rearguard. It should be noted that as the Signifers are squishy thaumaturges, the Eques are sturdier lancers, and the Hoplomachuses are even sturdier gladiators, you should take them out in that order if not using AoEs.
After a cutscene you'll be up top against an Imperial Eques, Imperial Signifer, Imperial Hoplomachus, and an Imperial Centurion. The centurion is your main foe here and significantly more sturdy than the rest, so deal with him last to cut down on the incoming damage. More reinforcements will appear as the fight progresses, including another Rearguard. The Rearguard takes priority as it will begin casting Self-destruct after a while. Failure to take it out will deal heavy damage and inflict a stack of vulnerability up to you and all your allies. Use AoE attacks as well if possible to prevent the other adds from building up.
The next wave will include two rearguards, and Yugiri will ask you to lead them to her. Do as she asks. She'll use a special variant of Doton that will inflict Slow on all enemies within it, making it more feasible to defeat them before they both blow up.
The wave after that will just be a lone Magitek Hexadrone. Dodge its 2-tonze Magitek Missile and Circle of Death AoEs, and be ready when it casts a standard Magitek Missile. This will mark you while several Magitek Mines spawn. After a brief delay the mines will all ready self-desctruct, and your marker will turn into a proximity AoE. Lay it as far from your allies as you can and run to safety yourself. He'll keep repeating these moves for the rest of the fight, so just deal with them as best you can until the Hexadrone falls.
The centurion is likely long gone by now, but the fight isn't quite over. Three more imperials will spawn, and shortly after FOUR Rearguards will spawn, and Tuned Magitek Turrets will fire Assault Cannons at you. Thankfully, Alphinaud has his LB. You and Yugiri should drag the whole pack over to the AoE circle while Alphinaud readies Starstorm and hold them until it goes off. This will massively damage all of them, leaving the rearguards are little health. They'll all begin casting self-destruct so take them out ASAP. Once you do, the fight will finally be over.