<human>:  Why did the French lose at the Battle of Salamanca?
<bot>: The French lost because they didn’t have enough troops. The French had around 200,000 soldiers in total, while the Spanish had around 250,000 soldiers. The French had to fight a defensive battle, while the Spanish had to attack. The Spanish had a huge advantage in artillery, which was used to devastating effect. The Spanish also had a huge advantage in cavalry, which allowed them to charge into the French lines and disrupt their formations.