For as often as it happens, nations typically don’t elect to enter wars if they know they will be long, drawn-out, uncertain and expensive affairs. They enter wars when they think the benefits of winning outweigh the risks, or when they think they have the means to strike decisively enough to bring the war to a quick resolution. Long wars result from consistent and fundamental errors: underestimating the will and ability of an enemy to resist, overestimating one’s own capabilities, going to war for incorrect or insufficient reasons, or underestimating the degree to which a powerful third party might intervene and shift the balance of power.
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