Confidence votes 4.0K. Napoleon succeeded in invading Spain in Febraury1808. The Spanish Royal House (the king Charles IV his family and the heir to the throne Ferdinand) were sent into exile and replaced by Napoleon's brother Joseph.onfidence votes 4.0K. Napoleon succeeded in invading Spain in Febraury1808. The Spanish Royal House (the king Charles IV his family and the heir to the throne Ferdinand) were sent into exile and replaced by Napoleon's brother Joseph.