Each man should have his particular post assigned to him, and be thoroughly instructed in the duties he will have to perform.

All auxiliary arrangements, such as palisades, abattis, &c., should be defended with the utmost obstinacy; the longer the enemy is held in check by these obstacles, the longer will he be exposed to the grape and musketry of the main work.
When he assaults the parapet, he will be opposed by the bayonet in front and a well-aimed fire in flank.

While in the ditch, or as he mounts the scarp, hollow projectiles, incendiary preparations, stones, logs, &c., will be rolled down upon his head.

But when the assaulting column has gained the top of the scarp, the bayonet forms the most effective means of resistance.
The measures resorted to in the attack and defence of the larger class of field-works, will necessarily partake much of the nature of the operations employed in the attack and defence of permanent fortifications.
II.

The attack and defence of a fortress may be carried on either by a regular siege, or by irregular operations and an assault.