August 19–20, 1847 · Valley of Mexico Theater
August 19–20, 1847
In the approach to Mexico City, American forces used the Pedregal — a massive lava field — to outflank Mexican defenses. Once again Lee conducted the key reconnaissance, finding a path through the Pedregal that allowed a flanking force under Persifer Smith to reach Valencia's rear. The assault lasted only seventeen minutes, routing Valencia's force and sending survivors fleeing toward Churubusco.
Commanders