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The mine, of course, need not stop at the wall, but can proceed within the city and when opened, pour soldiers out, behind the walls. - (Renegades of Gor, Chapter 10, Sentence #24)

The only closer entrenchments were sapping trenches, partly covered with wood, leading directly toward the walls. These were used not only for attempting to undermine the walls, but also for providing cover to men advancing for assaults. The sapping trench, of course, requires much less labor on the part of the besiegers but, too, it is less difficult to detect and stop than the mines. The mine, of course, need not stop at the wall, but can proceed within the city and when opened, pour soldiers out, behind the walls. The wall mine is usually terminated at the wall, which is then undermined but kept temporarily in place with a system of supports. Then later, concerted with an attack, these supports may be burned or, more dangerously, struck away. The coordination between the collapse of the wall and the attack can be sharpened when the supports are struck away, the same signal, say, the blast of trumpets, initiating both actions. - (Renegades of Gor)