Electronic attack can deceive or desensitize enemy battle commanders through insertion of spurious radar tracks or blot out entire avenues of approach.
Guilds were set up to provide lodging and employment for the emigrants, for a fee of course. The fee ensured that the worker would be paid a decent wage and that his employer would not deceive him.
Yet appearances can deceive, ecologists caution, and many of these exotics may be considered acceptable only because no one has documented their harmful effects.