Battle of Sobral

Battle context

The Battle of Sobral was part of the French Army of Portugal's attempt to probe the Lines of Torres Vedras, the extensive defensive fortifications constructed by Wellington to protect Lisbon. When Masséna's forces encountered these lines, they found themselves unable to force a passage. The scorched earth policy Wellington had implemented in the surrounding region denied the French army local supply, and the resulting hunger and disease inflicted severe attrition on the besieging force. By early March 1811, Masséna was compelled to order a retreat, having lost some 21,000 men to starvation and sickness rather than battlefield casualties. The engagement at Sobral thus formed part of a strategic confrontation that ended in a significant French operational failure, demonstrating that denial of resources and prepared defensive lines could defeat a numerically superior force without a decisive pitched battle.