If you have several chariots then you can choose to form them into a single loose unit or 'chariot squadron' if you wish. You do not have to do this, you can field the chariots as single units of one model if you prefer. The advantage of lumping your chariots together is that they will benefit from making all Leadership tests on the best Leadership value of the group in exactly the same way as a unit of troops led by a heroic character.

When fighting in a squadron in this way each chariot must be within 5" of another chariot in the same squadron forming a rough line or clump. The squadron does not have to adopt a formation as such and for this reason is referred to as a loose' unit. The models are still moved individually but must remain within their squadron for the duration of the game.