Alan,Van, sensei: The umbrella converage is quite inexpensive, and in my experience, the coverage does begin at one million.
What is the name of your umbrella policy's carrier, and could you post the insuring agreement providing coverage for assault and battery if committed in defense of person and property?
Are you sure your policy does not exclude intentional acts as regards the above?
Does your policy define Assault and battery?
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Van Canna