[That_Guy]

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Ratling Pros
-Are relatively cheap sniper units
-Can pin troublesome any heavy weapons squads
-Can infiltrate
-The special rule: go to ground

Ratling Cons
-Sniper units tend to draw alot of fire.
-Their low toughness means that they will suffer alot of casulaties
-Low LD, means its harder to pass priority checks. Which means its'll be harder to pin what your aiming for. Though a nearby officer helps out a bit. Unfortunately this means that infiltrate is pretty much wasted.
-You can only take a single squad
-Require a doctrine point
-Specialized

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The Ratling Low Down

The Guard answer to Eldar Rangers. Unfortunately low numbers and inferior weapons make the rangers a far superior choice. Unfortunately, you can't take them as its another race. Still they have their uses.

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Like Ogryns, this unit has very few choices. Infact, their only choice is squad size!

Like anything else, take as many as you can afford.

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Ratling Tactics

Put your ratling squads in a strategic point in your line, preferabley with at least one model in an officers LD range. With their sniper rifles, your not going to be moving much, if at all. Just keep shooting at monsterous creatures and enemy squads that are giving your problems. Hopefully you'll pin them.

Oh yeah, always deploy in cover unless you want meaty chunks where the Ratlings used to be.
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The Verdict?

Overall not a great choice for your army, though this unit does alot better against killing big creatures and lightly armoured foes.

One of the major draw backs is that you can only take one squad.

While not great on the regular battlefield, they do make pretty good kill teams.