Robe took part in Sir John Moore's retreat to Coruña, was engaged at the actions of Pombal, Sabugal, Fuentes d'Onore, El Boden, Badajos, Tarifa, Salamanca and the preceding attacks, Madrid, Burgos, Nivelle, Nive, Adour, and Bayonne. He was in no fewer than thirty-three actions as a subaltern, and was mentioned by Wellington for his distinguished conduct at Nivelle and Nive, where he commanded a mountain battery of artillery carried on mules.