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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Hog squeals are made by both boars and sows. The squeals of a wild hog sound very much like those of a domestic pig. Because of the wild hog's strong pack instinct and its curious nature, they will often investigate the sounds of other hogs squealing.