The Coil was a signature military tactic employed by Clan Steel Viper. The tactic involved a small force of two or three Stars, half of which pinned down the enemy while the second flanked and enveloped their position. Once in place the entire force began circling the enemy, slowly reducing the radius of the envelopment and restricting not only the enemy's ability to maneuver but also to concentrate fire on a specific target. The Coil only worked on enemy units of smaller size and, because each MechWarrior was forced to change their targets in violation of zellbrigen, generally suitable only for use against Inner Sphere and dezgra forces.
Clan Hell's Horses would utilize a variant of the Coil during the Dark Age era, using an assault-class 'Mech such as a Stone Rhino as the hub around which a force of highly mobile machines orbited.
- Invading Clans, p. 86
- Field Manual: Warden Clans, p. 140
- Recognition Guide: ilClan, vol. 2, p10 "Stone Rhino (Behmoth)"