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 "rts_cfg.h" file in the game directory. Change the values for the following lines to "0.0" so they resemble:
float EASY_DAMAGE = 0.0; float HARD_DAMAGE = 0.0;
Play under the easy or hard difficulty setting to have shields that cannot be harmed by normal weapons.