After the
Battle of Corunna,
Napoleon ordered Marshal
Jean-de-Dieu Soult to invade Portugal from the north. He was to seize
Porto by 1 February and
Lisbon by 10 February. Napoleon failed to take into account both the wretched condition and the roads or the fact that a full-scale
guerrilla war had broken out in Northern
Portugal and
Spain. Soult's
II Corps had four infantry divisions, commanded by
Generals of Division Pierre Hugues Victoire Merle,
Julien Augustin Joseph Mermet,
Étienne Heudelet de Bierre, and
Henri François Delaborde. Merle had four battalions each of the 2nd Light, 4th Light and 15th Line Infantry Regiments and three battalions of the 36th Line. Mermet's division included four battalions each of the 31st Light, 47th Line, and 122nd Line, and one battalion each of the 3rd, 4th and 5th Swiss Regiments. Heudelet led two battalions each of the 22nd Line and 66th Line, one battalion each of the 15th Light, 32nd Light, 82nd Line,
Légion du Midi, Paris Guard, and Hanoverian Legion. Delaborde's command comprised three battalions each of the 17th Light, 70th Line, and 86th Line. General of Division
Jean Baptiste Marie Franceschi-Delonne led Soult's corps cavalry, the 1st Hussar, 8th Dragoon, 22nd Chasseur à Cheval, and Hanoverian Chasseur Regiments. Attached were General of Division
Armand Lebrun de La Houssaye's 3rd Dragoon Division and General of Division
Jean Thomas Guillaume Lorge's 4th Dragoon Division. The 3rd Dragoon Division was made up of the 17th, 18th, 19th and 27th Dragoon Regiments. The 4th Dragoon Division consisted of the 13th, 15th, 22nd and 25th Dragoon Regiments. In all, Soult had 23,500 men, including 3,100 cavalry. Soult's first attempt to invade Portugal was stopped by the local militia on 16 February. The French then moved northeast to
Ourense in Spain, seized an unguarded bridge and marched south. On the way, Franceschi's cavalry overran Major General
Nicolás Mahy's Spanish brigade at
La Trepa on 6 March, inflicting 700 casualties. The French crossed into Portugal and occupied
Chaves on 9 March. From Chaves, Soult moved west to
Póvoa de Lanhoso where he was confronted by
Baron Eben's 25,000-man army composed mostly of Portuguese militia armed with muskets, pikes, and agricultural implements. After waiting several days for all his troops to arrive, Soult went over to the attack. On 20 March 1809, at the
Battle of Braga the French veterans butchered their adversaries. The outmatched Portuguese lost 4,000 killed and 400 captured. The French, who lost 40 killed and 160 wounded, also seized 17 Portuguese cannons. ==Battle==