The object of an attack is to destroy or capture the hostile force, or, at least, to drive it from the field. Capturing the enemy, or driving him from the field, cannot usually be effected by merely firing upon him. True, a mere fire at a distance may finally destroy him. But an insuperable objection to this mode of attack is, that while we are killing or disabling his men, he is killing or disabling as many of our own.