Breakdown Tactics in Rugby: The Ruck and Jackal Explained

The breakdown is the contest for the ball immediately after a tackle. It happens more often than any other phase of rugby — several times a minute — and it produces more penalties than anything else on the field.

It is also the part of the game that confuses new viewers most. Players seem to pile in, the referee blows the whistle, and it is not obvious why.

This article explains what is actually happening, what the referee is looking for, and how the laws changed for the 2026 Super Rugby Pacific season.

What the breakdown actually is

“Breakdown” is not a term in the law book. It is the everyday word for everything that happens between a tackle being completed and the ball being played away again.

It usually contains two things: a tackle and then a ruck.

A tackle is complete when the ball carrier is brought to ground and held. At that moment the tackler must let go, and the carrier must release the ball or make it available.

A ruck forms when at least one player from each team is on their feet and in contact over the ball while it is on the ground.

That distinction matters more than it sounds. Before a ruck forms, a defender may use their hands to grab the ball. The instant a ruck forms, hands are illegal for everyone, and the ball can only be played with the feet or picked up once it emerges.

The whole contest is often decided in under two seconds.

The gate: rugby’s most misunderstood rule

Players joining a ruck must enter from behind the hindmost foot of the last player from their own team. This imaginary entry point is called the gate.

You cannot come in from the side. You cannot come in from your opponents’ side. You come in through your own gate, facing forward.

This is the single most common breakdown penalty in the game, and it exists for a simple reason: a player entering from the side arrives unseen and unbraced, which is how neck and shoulder injuries happen.

The gate connects directly to the offside line, which our guide to offside rules in rugby union covers in more detail.

The jackal

The jackal is a defender who stays on their feet over the ball after a tackle and tries to win it before a ruck forms. The word comes from the animal — arriving over a kill and taking it.

It is usually an openside flanker, though any player can do it.

For a jackal to be legal, three things must be true:

They must be on their feet. Not kneeling, not leaning on the tackled player, not propped up with a hand on the ground. They must support their own body weight.

They must have arrived through the gate. Coming over the ball from the side is a penalty regardless of how good the technique is.

If they made the tackle, they must have released first. A tackler who goes straight from tackling to grabbing the ball has not released. They must let go and get back to their feet before competing again.

The window is tiny. As soon as an attacking player binds onto the jackal, a ruck exists and the jackal must let go of the ball immediately.

That is what makes it high risk. Win it, and you get a turnover or a penalty in good field position. Lose it, and you have one fewer defender in the line for the next phase.

The crocodile roll is no longer legal

For years, the standard way to remove a jackal was the crocodile roll: wrapping the defender around the torso and using body rotation to twist them off the ball and onto the ground.

World Rugby outlawed it. The ban came in with the law amendments effective from 1 July 2024 and remains in force.

The reason was player welfare. The roll applies a twisting force to a player whose head and neck are already in a loaded, vulnerable position over the ball. It was producing serious neck injuries.

Any article, video or coaching resource still teaching the crocodile roll is out of date. If you see it described as a technique to master — particularly with any instruction to target the neck area — treat that source as unreliable.

The legal alternatives are straightforward:

Get there first. The most reliable answer to a jackal is arriving before they are set.

Clear out low and through. Bind with the whole arm, get underneath the chest, and drive the player back past the ball with the legs.

Counter-ruck as a unit. Two or three players driving together past the ball, staying on their feet.

Attacking: securing the ball

For the team in possession, the breakdown is about speed rather than contest. Quick ball means the ball is available again before the defence has reset, which is where line breaks come from.

Coaches generally talk about ruck speed in seconds. Ball available in under about three seconds is considered quick; anything beyond five gives the defence time to organise fully.

The roles are usually drilled as follows:

The ball carrier works to fall so the ball ends up as far from the opposition as possible, arms extended back toward their own side.

The first arriving player deals with the immediate threat. If a jackal is over the ball, they clear them out. If nobody is there, they stay on their feet and stay available.

The second arriving player binds on to make the position immovable, or peels away to be an option in the next phase.

The judgement is how many players to commit. Every forward buried in a ruck is one fewer in the attacking line, so teams commit the minimum needed to make the ball safe.

Defending: contest or fold?

Defences face the mirror-image decision, and it is one of the genuine tactical choices in modern rugby.

Contest. Commit a player or two to the jackal or a counter-ruck. Wins turnovers, but risks a penalty and thins the defensive line.

Fold. Ignore the ruck entirely and get everyone into the defensive line, sprinting from the narrow side to the open side.

Most professional sides do both, selectively. They pick their moments — an isolated carrier, a slow support runner — and fold the rest of the time. Our guide to defensive systems in modern rugby covers how those defensive lines are organised.

There is also the choke tackle, where defenders hold the carrier upright rather than putting them down. If the ball is trapped, it becomes a maul, and a maul that stops means a scrum to the defending side.

The 2026 law changes

This is where a lot of coverage gets it wrong, so it is worth being precise.

The five-second rule is not new. When a referee judges the ball has been won and is available, they call “use it”, and the team has five seconds to play it away. That is Law 15.17 in the standard World Rugby law book and applies everywhere.

What changed for 2026 was a set of Super Rugby Pacific competition innovations. These are not global law. They apply in Super Rugby Pacific matches only, and not in Test rugby, the NPC or club rugby.

The change with the biggest effect on the breakdown is the no-late-joining rule. It targets the caterpillar ruck — the tactic where attacking forwards bind in a long line behind the ball, buying the halfback time and space to set up a box kick.

Under the 2026 rule, once “use it” is called, nobody else may join. The caterpillar cannot be extended, so the halfback has less protection and must move faster. Analysts expected more charge-downs as a result.

The halfback’s role

The halfback, or scrum-half, is the player who decides when the ball leaves the ruck. That makes them the tempo-setter for the whole team.

Their job at each breakdown is to read which side has fewer defenders, decide whether to pass wide, kick or run themselves, and get the ball moving before the referee’s clock runs out.

A halfback who occasionally snipes — picking up and running from the base — stops defenders from drifting away early, because someone has to respect the threat.

If you are new to how the positions fit together, our guide to rugby positions explains each number and role.

Why the breakdown decides matches

Slow ball lets a defence set. A set defence forces a kick. A kick hands over possession.

Quick ball does the opposite: defenders are still turning and realigning, gaps appear, and the attack builds momentum.

That is why sides invest so much coaching time here, and why breakdown penalties are so costly — they hand over both possession and field position in one whistle.

New to the sport more broadly? Start with our introduction to how to play rugby, or read about the other main contest for possession in our guide to the scrum.

Frequently asked questions

How is a ruck formed?
A ruck exists once at least one player from each team is on their feet and in contact over the ball while the ball is on the ground.

What is a jackal in rugby?
A defender who stays on their feet over the ball after a tackle and tries to win possession before a ruck forms. They must have entered through the gate and must support their own body weight.

Is the crocodile roll still allowed?
No. World Rugby outlawed it in the law changes effective from 1 July 2024, on player-welfare grounds, and it remains illegal.

What does “through the gate” mean?
Players joining a ruck must enter from behind the hindmost foot of the last player on their own side. Entering from any other angle is a penalty.

What is the five-second rule at the ruck?
Once the referee calls “use it”, the team in possession has five seconds to play the ball away. This is standard World Rugby law, not a recent invention.

What is a caterpillar ruck?
A long line of attacking forwards bound behind the ball, used to protect the halfback while setting up a box kick. Super Rugby Pacific’s 2026 rule preventing players joining after “use it” was aimed at reducing it.

Why do defenders sometimes ignore the ruck completely?
Because committing players to a contest they are unlikely to win leaves gaps in the defensive line. Folding into the line is often the safer choice.