Rome 2 Total War Siege from sea in game

Hello youtube, now i have Reached 127 BC, and trying to counqer Spain and Africa, finally to leave Italy lands to gain power and Empire. Become an Legion brother today: you can buy more games at this internett side: it is trough Pewdiepie. thanks to him. this wasnt an hard battle for my Pratorians, 3 units enganged the shores and the rest units outside of the wall and waited for the units to open the gates. but