Porter resigned from the US Navy in 1826 and later served as commander-in-chief of the Mexican Navy. During an earlier anti-piracy command he invaded Puerto Rico without authorization after a local official imprisoned one of his officers. He nevertheless promoted naval investment and helped Americans imagine a navy acting far beyond the home coast. The same confidence encouraged unilateral decisions that ignored political authority and the limits of his mission. A comparison with the pocket battleship Admiral Graf Spee makes the strategic point: a surface raider should preserve the campaign rather than seek out an enemy squadron merely to prove courage. Porter's legacy combines real institutional advocacy with an impulsive command style that Hillyar exploited at Valparaíso.
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Porter's promotion skills outlast his impulsive command style
Porter later resigned from the US Navy, commanded the Mexican Navy, and remained an energetic naval advocate whose self-belief repeatedly outran political authority and strategic judgment.