Editing Canadian football (section)

=== Defence ===
The rules do not constrain how the defence may arrange itself, other than the requirement that they must remain one yard behind the line of scrimmage until the play starts.

Defensive positions fit into three general categories:

==== Defensive linemen ====
: '''[[Defensive tackle|Left/right defensive tackles]]:''' Try to get past the offensive line, or to open holes in the offensive line for linebackers to rush the quarterback.
: '''[[Nose tackle]]:''' A defensive tackle that lines up directly across from the centre.
: '''[[Defensive end|Left/right defensive ends]]:''' The main rushing linemen. Rush the quarterback and try to stop runners behind the line of scrimmage.

==== Linebackers ====
: '''[[Linebacker#Middle linebacker|Middle linebacker]]:''' Starts the play across from the centre, about 3–4 yards away. Generally, the leader of the defence. Calls plays for linemen and linebackers.
: '''[[Linebacker#Outside linebacker|Weak-side linebacker]]:''' Lines up on the short side of the field, and can drop back into pass coverage, or contain a run.
: '''[[Linebacker#Outside linebacker|Strong-side linebacker]]:''' Lines up on the long side of the field, and usually focuses on stopping the runner.

==== Defensive backs ====
: '''[[Cornerback]]:''' Covers one of the wide receivers on most plays.
: '''[[Halfback (Canadian football)|Defensive halfback]]:''' Covers one of the slotbacks and helps contain the run from going to the side of the field.
: '''[[Safety (gridiron football position)|Safety]]:''' Covers the back of the field, usually in the centre, and as the last line of defence. Occasionally rushes the quarterback or stops the runner.