Yari Wall
The yari wall is a technique employed by yari ashigaru, enabling them to lock together and present their weapons in a single direction. Whilst the ability is active the unit moves and turns slower. Attacks made to the front of a yari wall are far less effective; cavalry charges made against them are practically useless. Attacks made to the rear or flanks of a unit are far more damaging whilst the yari wall is presented, so the ability is best used when several units are close together and protected by cavalry. Once activated, the yari wall works for a short time only before burning out. It is then unavailable for a fixed period, thereby limiting its exploitability.