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Cadian Regiment Doctrine states Cadians get to Re-roll hit rolls of 1 if they did not move in the previous Movement phase. If you are preforming Overwatch that means the previous Movement phase was your opponents Movement phase.

The FAQ states :
Q: If an ability does not state its effects take place in a ‘friendly’ phase or ‘enemy’ phase, does that mean it works in every such phase (e.g. Mortarion’s Host of Plagues ability, which takes effect ‘at the start of the Fight phase’)?
A: Yes.

The brand new FAQ also states:
Q: When a rule allows a model or unit to take an action (move, shoot, charge, fight or attempt to manifest a psychic power) outside of the normal turn sequence, and that rule explicitly mentions to make that action as if it were a different phase of the turn structure to the current one, e.g. ‘That unit can shoot as if it were the Shooting phase’, do rules that are normally used during that phase (in the example this would be the Shooting phase) take effect? Is the same true of Overwatch attacks?
A: With the exception of Stratagems, all rules (e.g. abilities, Warlord Traits, psychic powers etc.) that would apply in a specific phase apply to actions that are taking place ‘as if it were that phase’. However, if a Stratagem specifies that it must be used in a specific phase, then
it can only be used in that phase (e.g. you cannot use a Stratagem that says ‘Use this Stratagem in the Shooting phase’ to affect a unit that is Shooting ‘as if it werethe Shooting phase’). For the purposes of this FAQ, Overwatch attacks are also considered to be attacks made as if it were your Shooting phase.

So does this mean that if you have Cadians that did move in your opponents Movement phase and then get charged that turn, that they do get to re-roll 1s during overwatch since they did not move in the previous (opponents) Movement phase??

Yes, this means that barring some weird shenanigans, your Cadians always re-roll 1's in overwatch.

GW knocking it out of the part with intuitive and sense-making rules writing, I must admit. Good thing there isn't any other silliness like Flamers automatically hitting Aircraft a mile in the sky going Mach 20, somehow...

RAW, it would also indicate that any movement that has occurred outside of movement phase would not hinder the CT from triggering.

 BaconCatBug wrote:
Yes, this means that barring some weird shenanigans, your Cadians always re-roll 1's in overwatch.

GW knocking it out of the part with intuitive and sense-making rules writing, I must admit. Good thing there isn't any other silliness like Flamers automatically hitting Aircraft a mile in the sky going Mach 20, somehow...

I will concede that when you explain to me how your mile in the sky mach 20 airplanes are stopping my monster from moving on the ground with its legs.

topaxygouroun i wrote:

 BaconCatBug wrote:
Yes, this means that barring some weird shenanigans, your Cadians always re-roll 1's in overwatch.

GW knocking it out of the part with intuitive and sense-making rules writing, I must admit. Good thing there isn't any other silliness like Flamers automatically hitting Aircraft a mile in the sky going Mach 20, somehow...

I will concede that when you explain to me how your mile in the sky mach 20 airplanes are stopping my monster from moving on the ground with its legs.

That's been fixed.

topaxygouroun i wrote:

 BaconCatBug wrote:
Yes, this means that barring some weird shenanigans, your Cadians always re-roll 1's in overwatch.

GW knocking it out of the part with intuitive and sense-making rules writing, I must admit. Good thing there isn't any other silliness like Flamers automatically hitting Aircraft a mile in the sky going Mach 20, somehow...

I will concede that when you explain to me how your mile in the sky mach 20 airplanes are stopping my monster from moving on the ground with its legs.

Carpet bombing.

As skchsan points out, this is taken care of in the new FAQ by creating the new AIRCRAFT category with some restrictions on what they can block.

What the Cadian doctrine eprobably should say is: Re-roll hit rolls of 1 in the Shooting phase for units with this doctrine if they did not move in their preceding movement phase.

But it doesn't say that, so you get this result.

 skchsan wrote:
RAW, it would also indicate that any movement that has occurred outside of movement phase would not hinder the CT from triggering.

CT = Cadain trait?

If so I agree.

 Rockguy475 wrote:

 skchsan wrote:
RAW, it would also indicate that any movement that has occurred outside of movement phase would not hinder the CT from triggering.

CT = Cadain trait?

If so I agree.

Could also mean Chapter Tactic, as a universal for Regimental Traits, Household Traits, Forge World Traits...

But yeah, in this instance, regardless of exact nomenclature, it means Cadian ability.