Epic Celtic migratory waves are great fun!

Make at least three full stacks, each made up of 1 FM, 2 Leuce Epos, 3 slingers and 14 Levy Spearmen. On Huge unit size each stack is about 4,000 men. Then move them towards where you want to conquer and settle, keeping the stacks VERY close to each other, standing in a triangle shape, so that if one is attacked, the other two will join the battle. Or surround an enemy stack before attacking if you want to start the fight, so that all three of your armies join in.

In the battle you don't need anything very fancy, you can pretty much just pile in and swamp them with hordes of your bare-chested bravos.....your levy spearmen might not be very good fighters one on one, but with a numerical advantage of between 3 and 6 to 1, you can own any enemy army, no matter how good it is. Quantity is its own quality. Hundreds of your men will die bravely but who cares as long as you win?

If you plan to go a long way from your homeland, you might want to make 6, 9, or even 12 such full stacks before beginning your journey, so that at least some of your people make it to the end of the journey.