Anvil Siege Force: The 11th-Edition Space Marines Gunline Detachment

Anvil's rule gives all your ranged weapons the Heavy ability — which means +1 to Hit whenever the unit Remained Stationary. Weapons that were already Heavy instead grant +1 to Wound while stationary. The payoff is simple and strong: a gunline that holds its ground shoots more accurately across the board, and your heavy vehicles wound harder. The flip side is the whole bonus evaporates the turn you move, so Anvil is a commitment to positioning over manoeuvre.

• Battle Drill Recall (Shooting) — a unit gains Sustained Hits 1, and if it Remained Stationary its Critical Hits trigger on 5+, so the sustained hits fire far more often. Your damage-amplifier on a key gun unit.
• No Threat Too Great (Shooting) — re-roll Wounds against Monsters or Vehicles. Your answer to enemy tanks and big models.
• Not One Backwards Step (Command) — an Infantry unit near an objective doubles its Objective Control but must stay still. Pins a contested objective hard.
• Rigid Discipline (end of Fight) — a unit peels 6" out of combat back toward safety, so a gunline caught in melee can Fall Back and keep shooting.
• Hail of Vengeance (defensive) — a unit that just lost models to enemy shooting fires back at the attacker. Overwatch-style punishment.
• Armour of Contempt (defensive) — worsens incoming AP by 1 to keep an anchor alive.

• Architect of War — the bearer's unit ignores cover. The signature pick: bolt it onto Hellblasters or Devastators to strip cover saves off objective-campers.
• Indomitable Fury (Gravis model) — the first time the bearer dies, it can stand back up at full wounds; resilience for a key anchor character.
• Fleet Commander (Captain) — a once-per-battle ranged mortal-wound bombardment along a marked line.
• Stoic Defender — Feel No Pain 6+ while on an objective, and the unit keeps half its Objective Control even while Battle-shocked. Pure objective-holding durability.

• Hellblasters — the core carry unit: high-volume AP plasma that, with Architect of War (ignore cover) and a Lieutenant (Lethal Hits), puts out brutal stationary fire.
• Gladiators / Repulsor Executioner — their weapons are already Heavy, so they get the +1-to-Wound half of the rule while stationary.
• Eradicators — anti-tank that can Rapid Ingress into a firing lane, then unload; superb with No Threat Too Great.
• Heavy Intercessors / Centurions — durable stationary objective-holders and heavy-weapon platforms.
• Characters (Captain, Lieutenant, Gravis Captain) — your enhancement carriers that buff and anchor the gunline bricks.

Take Anvil when your collection is built around heavy weapons and durable infantry and vehicles, and you want to win by controlling firing lanes and holding home and mid objectives rather than by manoeuvre. It's the go-to over mobile detachments like Gladius or Firestorm when the mission and terrain let you set up strong static positions. Avoid it if your list wants to advance-and-charge — the whole payoff is conditional on staying still.

Sample gameplan: deployment is the game here. Anchor infantry bricks and a vehicle or two with overlapping firing lanes onto the midfield and objectives, and attach Architect of War plus a Lieutenant to your key Hellblasters. Each turn, Remain Stationary for the army-wide +1 to Hit, then spend CP on Battle Drill Recall to fish for crits or No Threat Too Great to delete an enemy tank. Lock objectives with Not One Backwards Step, and on defence lean on Armour of Contempt, Hail of Vengeance and Rigid Discipline.