public function createFromSession(Session $session)
 {
     if ($session->has('fleet')) {
         $fleet = unserialize($session->get('fleet'));
         $shots = unserialize($session->get('shots'));
         $hits = unserialize($session->get('hits'));
         $this->battlefield->setFleet($fleet);
         $this->shotsManager->setAllShots($shots);
         $this->shotsManager->setHits($hits);
     }
     $this->create();
 }