In November 1809, Werlé led a Polish division in IV Corps at the decisive French victory at the Battle of Ocaña. His 5,600-man brigade (actually the size of a division) formed the French reserve at the Battle of Albuera. He was killed in that battle when Marshal Soult sent the reserve into the battle. After a bitter firefight with Lowry Cole's British division, Werlé's French soldiers were defeated.