This guide will provide you with the best formation for all the levels of Legacy Campaign in a Totally Accurate Battle Simulator.
General tip:
Use first-person mode in difficult levels, Often you are better than the A1.
How to unlock legacy campaign:
Unlock all secret units from the legacy map.
The start

The best formation for this level is 13 snake archers and one shield bearer.

Poaching Boxers

42 Archers, 1 square is the best formation for this level.
Rush

The best formation for this level is 20 Painters and one DA Vinci tank.
Bomb

1 shield-bearer, 1 king, and two healers are the best formation for this level.
Bomb Rush

The best formation for this level is 4 Musketeers and one DA Vinci tank.
Siege

10 Berserkers and 5 Valkyries is the best formation for this level.
Pharaoh Of Poison

The best formation for this level is 4 Halflings and 11 snake archers.
Flag And Banners

One Squire and one Deadeye is the best formation for this level.
The Wizard Behind The Wall

The best formation for this level is 15 bomb Throwers, one Quickdraw, and one halfling.
A Tank

7 Ballistas and 7 shield bearers are the best formation for this level.
The War

The best formation for this level is 16 Ballistas and 12 Halflings.

Thor’s Battle

One miner and 4 quickdraws are the best formation for this level.
The End

The best formation for this level is 8 Quickdraws, 3 Dyn, and throwers.
Ambushed By Mages

One Poacher and one Thor is the best formation for this level.
Angry Mammoth

The best formation for this level is 2 peasants and 27 lowdarters.
Over The Bridge

10 Peasants, 4 pikes, and 9 blowdarters is the best formation for this level.
Flanking Wheelbarrows

The best formation for this level is 93 Peasants and 2 flag bearers.
Swords And Arrows

6 Peasants and one Thor is the best formation for this level.
Ings And Their Catapult

The best formation for this level is one Thor, one Wizard, and 6 Peasants.
A Formation

6 Peasants and one thor is the best formation for this level.
Saving Billy

The best formation for this level is 3 Barrel rollers, one thor, one wizard, and 15 peasants. You have to move the pharaoh away from Zeus and the minotaur.
Jump In

One thor, 2 Barrel rollers, and 20 Peasants is the best formation for this level.
Frosty Jarls

The best formation for this level is 4 Barrel rollers, 25 poachers, 3 peasants.
Surrounded By Swords

26 Peasants and 31 Poachers is the best formation for this level.
Monkeying Around

The best formation for this level is 28 Blowdarters and one peasant.
Muskets And Halberds

41 Poachers and 2 peasants are the best formation for this level.
Da Vinci’s Balloons

The best formation for this level is 25 Blowdarters and 6 peasants.
Captain And The Crew

10 peasants, 2 thors, and one pike is the best formation for this level.
The Queen And Cannons

The best formation for this level is 2 peasants and 27 Blowdarters.
Hungry Ghouls And Vampires

One Banner bearer, 18 Poachers, and 31 peasants are the best formation for this level.

Reaper’s Skeleton Army

You will need to control the tank, avoid being hitted by catapult pumpkins, and kill enemies as fast as possible. Reapers and catapults are most dangerous so try to kill them as early as possible.
The best formation for this level is 2 Thors, 29 peasants, and 6 poachers.
Brawl Your Way Out

26 Peasants, 8 blowdarters, and one banner bearer is the best formation for this level.
The Last Standoff

The best formation for this level is Peasants only.