How do you set up brigade for those defense

Each team needs mixed colors and mixed emblem with some enemy and player phase units.

Couple of hints I can give:
1. It might take you multiple tries. They do give us a long time for a reason.
2. Study your opponents carefully, the ones who you can see before entering the map. Maybe figure out a way to take out 1-2 opponents to enable tanks in the next few rounds to avoid getting hit, for example, by a mage who has colour advantage over them.
3. Put your strongest tanks at the very end, when your position has endured the most pressure.
4. Most of the time, don't try to kill them. This is a stalling game. It's ideal if you can sit on your camp, use it as a defense tile; take little damage; heal 10HP every turn. Even more ideal if the unit in front of you is some dummy with bad attack or some TA weapon, and then you can just park a mage of your opponent's disadvantaged colour in front of him and the entire enemy horde gets stuck behind him. If you can get a blockade like that, avoid killing the dummy if at all possible. He's a traitor to his own army; he's in everyone else's way.
5. Use daggers. Debuffing their atk is a really good idea; if you use rogue dagger then you're also buffing your own def. Savage blows will keep their healers busy.
6. Use healers and witchy wand. If they an charge up a big special, they might break the stalemate you establish. Healers can also, of course, heal up your front-liners.
7. Most of the time, use aether tanks rather than tanks with ignis or glacies. Again, the objective is not to crash through; it's to sit there and not give an inch. Aether does less damage, which can be better for letting some harmless dummy in front of you survive, plus it heals you.
8. Fast tanks can be a good idea. They tend to take less damage because they get doubled less and you're not running into bold fighter on every other unit. They tend to be much better in colour disadvantage matchups because they don't get doubled.