 Complete the following phrase:  The loss of so many notable senatorial supporters was a further blow to the Optimate cause following the devastating defeat at Thapsus. Cato the Younger, another very prominent leader of the faction, had also committed suicide at Utica around this time. The remaining Optimate forces regrouped in Hispania under the leadership of Titus Labienus, Publius Attius Varus, Gnaeus Pompeius Pompey the Younger and Sextus Pompeius where they would face eventual defeat to Caesar at the 