If possible, the point of the bayonet should be directed against the opponent's throat, as the point will enter easily and make a fatal wound on entering a few inches, and, being near the eyes, makes the opponent flinch. Other vulnerable, and usually exposed parts are the face, chest, lower abdomen and hights, and the region of the kidneys when the back is turned. Four to six inches penetration is sufficient to incapacitate and allow for a quick withdrawal, whereas if a bayonet is driven home too far it is often impossible to withdraw it. In such cases a round should be fired to break up the obstruction.
Guiding rule number 8 for weapons training, from the British Army Training Manual
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