Rules Clarification:  : Cavalry      (Edit)
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• Although the core rulebook specifies mount weapons have 0.5" range, this doesn't "overwrite" models that have a longer mount range listed on their card. (Infernal Ruling)
• Mount Weapons are melee weapons. (Infernal Ruling) This means:
  • Mount Attacks can benefit from any buffs that affect "melee weapons" (such as Acidic Touch and Elasticity) or "melee attacks" (such as Battle Lust).
  • Mount Weapons can be used to make free strikes.
  • If the model doesn't have any regular melee weapon (such as the Gun Carriage) then it does have a melee range, can engage enemy models, and can make free strikes; anyway.
  • Despite being a melee weapon, you cannot use a Mount's special attack on the same activation you charge. (Infernal Ruling)
    • Exception: If you have Trampling Hooves, because that allows you to make charge attacks with your mount when you charge.
• Mount attacks will trigger "Melee attack" stuff like Battle Wizard.
• You can purchase additional attacks with your Mount Weapon. (Infernal Ruling)

Impact Attacks - Movement

• Impact Attacks "pause" your charge move, and as such don't normally trigger "ends an advance" abilities (such as Countercharge).
  • The exception is if your Impact Attacks include your charge target, then you have to end the charge movement and turn to directly face the charge target before rolling any dice. In this case, stuff like Countercharge will get triggered before you get to roll your Impact Attacks.
• You cannot "pause" in an illegal position to carry out Impact Attacks. For instance: a Pathfinder cavalry model pausing halfway over an obstacle; a flying cavalry model pausing while it 'overlaps' other models; or any cavalry model pausing halfway through an Incorporeal model.

Impact Attacks - The attack(s)

• You resolve stuff that occurs "after the attack is resolved" (such as Battle Wizard) before continuing with your charge movement.
• If you have an ability that boosts your "first" melee attack (such as Stir the Blood), then only one attack will be boosted even though you're making multiple simultaneous attacks.
• If you choose to make any impact attacks, you make all attacks against all models in the Mount's melee range (even friendly models).(Infernal Ruling)
• Impact Attacks cannot be boosted, refer core rulebook.
• You cannot buy additional attacks while resolving Impact Attacks. Additional attacks can only be bought during your Combat Action, after resolving your initial melee attack(s) / special melee attack.

Impact Attacks - Other

• You cannot use "any time" abilities while resolving Impact Attacks. Because Impact Attacks occur during movement; and you can only use 'any time' abilities before moving or after moving, but not during movement. (Infernal Ruling)
  • Exception: If your Impact targets include your charge target, then your movement has ended (refer rulebook, last paragraph of 'Impact Attacks') and thus you're fine to use "any time" abilities.

Cavalry unit

• If you have a unit of Cavalry, charge them and do impact attacks, remember you interrupt movement to do impacts, but you have to resolve all movements before doing any charge attacks. So for example it would go:
  • Cavalry model A charges enemy X, and contacts model M. Stop and make impact attacks against M. Then continue movement to X.
  • Cavalry model B charges enemy Y, and contacts model N. Stop and make impact attacks against N. Then continue movement to Y.
  • Cavalry model C charges enemy Z, and contacts model O. Stop and make impact attacks against O. Then continue movement to Z.
  • Resolve model A's charge attack vs X, B's vs Y, and C's vs Z. (This can be done in any order, as per normal)

Other interactions

• Cavalry model with no melee weapon
  • If you have a Mount weapon but no regular Melee weapon (such as the Efaarit Scout), you can still declare a charge. (Locked thread)
  • You can make Impact Attacks along the way.
  • Once you get to the charge target, however, you can't make a melee attack against it. Because you can't use the mount weapon for a charge attack, due to the way the Cavalry rules are written. (Unless you have a rule like Trampling Hooves.)
  • If you don't charge, the mount attack can be used as an initial melee attack.
• Countercharge & Cavalry ( Edit )
  • A model with Countercharge and Cavalry can make Impact Attacks during the countercharge. (Refer "Charges Outside of Activation" in the rulebook).
• Warcaster/Warlock Cavalry ( Edit )
  • Warcasters/Warlocks can't cast spells or use their feat while resolving Impact Attacks. Because Impact Attacks occur during movement - you can use spells or feat before moving, or after moving, but not during movement.
    • Exception: If your Impact target(s) include your charge target, then your movement has ended (refer rulebook, last paragraph of 'Impact Attacks') and thus you're fine to use "any time" abilities before starting the Impact attacks.

• Flight on a Cavalry model (Edit)
  • Although flyers can move over obstacles/models, and horses can pause to do impacts while charging, flying horses cannot make impact attacks while overlapping models/obstacles. You need to pause in a legal position.
• Gunfighter & Cavalry ( Edit )
  • A cavalry model that charges then makes a Gunfighter attack will not gain a boosted charge attack roll, because a ranged attack is not a charge attack. (Infernal Ruling)
  • You also won't gain a boosted charge damage roll, as per normal for a Gunfighter.