There are several defensive formations commonly used in eight-man football. Defensive formations are classified by the total number of linemen and linebackers in the formation. The three basic types of formations in eight-man football are seven-man fronts, six-man fronts and five-man fronts.
As in 11-man football, formations are described in a (number of defensive linemen)-(number of linebackers)-(number of defensive backs) format.
Seven-man fronts are primarily used either against teams that pose no threat with the passing game or in short-yardage running situations. Even though linebackers have increased pass coverage duties, the emphasis is still on stopping the run.
Consists of either three down linemen or one down lineman and two up lineman, four linebackers and one safety. Linebackers have all pass coverage responsibilities with the safety playing deep cover. When three down lineman are used, outside linebackers have contain responsibilities plus their pass coverage.
The line consists of two tackles and two ends. Tackles line up anywhere between heads up on the offensive guards to the shoulders of the center. Responsible for run stop through the middle of the line. Ends line up in an up position on the outside shoulder of the widest offensive lineman. Acts as the "contain" man.
There are two outside linebackers and one middle linebacker. The middle linebacker lines up between the tackles off the line of scrimmage; this player stops the run up the middle of the formation and has pass coverage on running backs. Outside linebackers line up between the tackles and ends off the line of scrimmage, stopping the runs through the gap between the offensive guard and offensive end (the "B gap") and has pass coverage on the tight or split ends. The lone defensive back plays a deep zone in pass coverage.
This defense consists of three down linemen, two up linemen, two linebackers and one safety; usually a goal line defense.