Suicide or Martyrdom?
In the argument of whether operations where the person brings death upon himself are allowed or not, the ones who oppose this form of Jihad use the main argument that it is suicide because death was not brought by the enemy but by the person himself.
Ibn al Athir, in al-Kamel, mentions an incident that happened during the siege of Acre by Salahudeen. Unfortunately, he mentions it in passing without a comment.