Note: This procedure requires editing a game file; creating a backup copy of the file before proceeding is recommended. With a text editor, edit the "LAi_location.c" file in the "\Program Files\Pirates of the Caribbean\PROGRAM\Loc_ai" directory. Locate the line:

location.noFight = "1";

...and change it to

location.Fight = "1";

You can now attack anything inside taverns, stores, prisons, loanshark's offices, shipyards, etc.