In 1859, Geffrard made the first attempt in negotiating with the Dominican Republic under the regime of Pedro Santana. Unfortunately, in March 1861, Pedro gave his country back to Queen Isabella II of Spain, thus making Haitian officials nervous about having a European power back on their borders. In May of that year, guerilla war broke out in Santo Domingo against Spain. Geffrard sent his personal guards and men to help out the rebels against Spanish troops, but in July 1861, Spain gave Haiti an ultimatum for participating and supporting the Dominican rebels. In the end, Geffrard agreed to surrender to Spanish demands and dropped all intervention within Spanish territory in the east. This episode left many Haitians humiliated and angry at Geffrard because he backed down to a European nation while Faustin Soulouque would have never accepted it.