Battle common foe rule

The Battle common foe rule is a narrative and ethical principle in The Hobbit that governs the behavior of the story's warring factions when confronted by a threat that surpasses their own conflicts. It dictates that the appearance of a greater, shared enemy—in this case, the goblin and Warg horde—immediately suspends all prior hostilities, forcing the previously opposed parties into a temporary but decisive alliance. This rule is the structural pivot of the book's climax, transforming a three-sided siege over treasure into a desperate, unified defense against annihilation.

Origin and Precedent

The principle is not explicitly codified in the text but emerges from the story's logic of survival. Before the Battle of the Five Armies, the dwarves under Thorin Oakenshield are besieged within the Lonely Mountain by the combined forces of the Lake-men and the Wood-elves, who demand a share of the dragon's hoard. The conflict is bitter and entrenched, with Thorin refusing to parley with armed men at his gate and even shooting an arrow at a messenger. This standoff is the direct result of the dragon Smaug's death, which left the treasure unguarded and ignited greed and old grievances among the different peoples. The situation is a classic stalemate, with no resolution in sight.

The Trigger: The Goblin Onslaught

The rule is activated by the sudden and overwhelming arrival of the goblins. As the armies of men and elves prepare to attack the dwarves, a vast host of goblins and Wargs, led by Bolg, descends from the North. The goblins are the ancient and universal enemy of all the free peoples, and their appearance instantly redefines the stakes. The conflict over gold becomes trivial compared to the existential threat of goblin dominion. Gandalf, who appears at this critical moment, halts the impending battle between the dwarves and the allied men and elves, declaring, "Dread has come upon you all!" He then calls for a council, and the former enemies are forced to recognize that their only hope is to unite against the common foe.

The Alliance and Its Execution

In the council that follows, the Elvenking, Bard, and Dain (who had arrived with his dwarven reinforcements) agree to a plan. All previous quarrels are forgotten. The goblins are the foes of all, and at their coming, all other quarrels are set aside. The allied forces take up positions on the great spurs of the Mountain, luring the goblin army into the valley between. The elves charge first, their hatred for goblins cold and bitter, followed by the dwarves of the Iron Hills and the men of the Lake. This unified front, though outnumbered, is able to stem the first onslaught. The alliance is not a formal treaty but a pragmatic, desperate pact born of shared peril, and it holds until the tide of battle is turned by the arrival of the Eagles and Beorn.

Consequences and Significance

The Battle common foe rule is the mechanism that resolves the story's central conflict without requiring any of the parties to compromise their principles or forgive past grievances. It allows for a heroic, unified victory that would have been impossible for any single faction. The rule's application has lasting consequences: the goblin army is destroyed, bringing peace to the North for many years. The alliance, though temporary, fosters a new era of friendship between elves, dwarves, and men, as seen in the subsequent rebuilding of Dale and the prosperity of Lake-town. The rule thus serves as a narrative device that transforms a potential tragedy of greed into a triumph of collective survival, underscoring a key theme of the book: that even the deepest divisions can be overcome when faced with a greater evil.