The rapid-fire battle cannon is the main gun carried by several Imperial Knight patterns, a heavier battle cannon tuned for a higher rate of fire. It’s the reason a Knight can chew through infantry squads and still crack open tanks, which makes it one of the most flexible weapons in an Imperial Knights list.
What it actually is
A battle cannon is a big, projectile-firing gun, essentially an upscaled autocannon. It’s too large to carry, so you’ll only ever see one mounted on a vehicle. The classic example is the Leman Russ, where the gun is a 120mm smoothbore with a water-cooled jacket and gyrostabilisers so it can keep hitting targets while the tank moves.
The rapid-fire version takes that same idea and fits it to Imperial Knights. Same shell, same punch, but built to fire faster. That’s the whole point of the name: it trades nothing in calibre and gains a lot in volume of fire.
Why it matters on the tabletop
In 10th Edition the rapid-fire battle cannon is a 72″ ranged weapon with a D6+3 Attacks characteristic, Strength 10, AP -1, Damage 3, and the Blast and Rapid Fire D6+3 keywords. That’s a profile that genuinely does two jobs at once.
The Blast keyword means it gets more shots the bigger the target unit is, so it’s a real threat to hordes. The Rapid Fire keyword means it gets extra shots when it’s within half range, so pushing a Knight forward makes the gun better rather than worse. High Strength and Damage 3 mean it still threatens elite infantry and light vehicles.
- Range 72″, so it can reach across most of the board
- D6+3 attacks, hitting on a 3+
- Strength 10, AP -1, Damage 3
- Blast and Rapid Fire D6+3 keywords
Who carries it
The rapid-fire battle cannon shows up on Imperial Knights, most notably the Knight Crusader and Knight Paladin. On the Crusader it’s often paired with a Questoris heavy stubber, giving the pilot a cheap secondary gun to chip away at lighter targets.
It’s worth separating this from the standard battle cannon. The Leman Russ, the Castigator and various other Imperial vehicles mount the ordinary version. The rapid-fire variant is specifically a Knight weapon, and that’s how the lore treats it: a specialised pattern with an improved rate of fire rather than a general-issue tank gun.
Ammunition and how it kills
Battle cannon shells share a common design: a ballistic cap for flight performance, a fuse that can be set for impact or a timed delay, explosive filler, a propellant charge, and tracer material. The two main types are high explosive and armour piercing.
HE rounds like the Leman Russ Mk4 G4 carry a big charge of something like Fyceline. They don’t need high velocity, so there’s more room for explosive, and the blast plus shell fragments make them lethal against infantry and light vehicles. AP rounds like the Mk12 G4 are solid shot with an adamantium tip under a soft metal cap, designed to bite into sloped armour and punch through. Most of their damage comes from kinetic energy and the spalling it causes inside a tank.
Key facts
- The rapid-fire battle cannon is a Knight-mounted battle cannon with an improved rate of fire
- In 10th Edition it’s 72″ range, D6+3 attacks, 3+ BS, S10, AP -1, D3, with Blast and Rapid Fire D6+3
- Battle cannons are upscaled autocannons, too big for infantry to carry
- The Leman Russ battle cannon is a 120mm smoothbore with a water-cooled jacket and gyrostabilisers
- It fires high explosive rounds for anti-infantry work and armour piercing rounds for tanks
FAQ
Is the rapid-fire battle cannon the same as a Leman Russ battle cannon?
Not quite. They fire the same kind of shells, but the rapid-fire version is a Knight-specific pattern built for a higher rate of fire. The Leman Russ mounts the standard battle cannon.
Which Knights can take a rapid-fire battle cannon?
It’s a common option on Imperial Knights such as the Knight Crusader and Knight Paladin, usually alongside a secondary weapon like a heavy stubber.
What’s the rapid-fire battle cannon good against?
Almost everything. Blast makes it strong against hordes, Rapid Fire rewards closing the distance, and Strength 10 with Damage 3 means it still hurts elite infantry and vehicles.