When a Samurai is defeated in battle, thus dishonouring himself, he may choose to perform seppuku on the battlefield to cleanse himself of his shame, or to avoid being captured as a prisoner.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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Whenever a unit comprised wholly of models with this special rule is required to take a Break Test, they may choose to do so using 3D6, discarding the highest dice. However, if this test is failed, you must remove the entire unit as a casualty. The enemy then cannot pursue or overrun, but may reform as normal.