As with scouts and spies, assassins normally are not battlefield leaders. They move mostly alone, without armies.
However, they serve not merely for information gathering, which they do worse than the spy; they directly stab at the enemies of their ruler. When in enemy territory, an assassin may be ordered to choose an enemy commander and attempt to assassinate him. If the assassin eludes detection by the province's patrols, it will end up as a battle between him and the target -- and the target's bodyguards; the assassin must kill or die, for to flee is to die.