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So you move them like in 40k... kinda? Or do they have to like stay in ranks but be half an inch away?

You must stay in ranks. To move, I find it easiest to move the center model of the front rank to where you want the rest of the unit to be. Then form everyone around him, making sure he is still in the center of the first rank. When you declare a charge with them or some declares a charge against them, you must rank them up properly.

I thought they just moved like in 40K, and only Rank Up when Charging. Otherwise, there's little point in the whole 'Skirmishers' rule.

I didn't mean actual base-to-base ranks but in a loose formation with definite ranks and files.

Hellstorm is correct.
Skirmishers have free reform (within double of the movement)
Can march and shoot
-1 to hit when being shot at.

The last rank can't have.more than the othe ranks.