The criminals, including two who wore Halloween masks, broke into the Pennsbury Township home of 63-year-old Fred Barakat last week.
During the struggle, one of the men shot Barakat in the knee and tied him up.
They then rummaged through his home before taking off in a white or cream colored car.
Investigators suspect two of the attackers wore masks because Barakat might recognize them.
Barakat is a prominent lawyer with an office in Wilmington. He specializes mostly in bankruptcy cases.