Military tacticians and historians often make use of the term 'tip of the spear.' It refers to a combat force that is used to puncture the enemy's initial lines of defense, to be quickly followed by concentrated forces which destroy any remaining threat.
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Black powder is relatively insensitive to shock and friction and must be ignited by flame or heat. Though it has largely been supplanted by smokeless powder as a propellant for ammunition in guns, black powder is still widely used for ignition charges, primers, fuses, and blank-fire charges in military ammunition.