You could try getting some speeders (BARC, swamp/ISP (Infantry Support Platform))to deal with heroes, they deal high damage where heroes fall like butter (dead in seconds when undefended/separated from their army); or get some Jedi or air units. You could get an anti air unit, the UT-AA. There might be a order 66 mission event that you have to research to unlock the order 66 units.
You could try getting some speeders (BARC, swamp/ISP (Infantry Support Platform))to deal with heroes, they deal high damage where heroes fall like butter (dead in seconds when undefended/separated from their army); or get some Jedi or air units. You could get an anti air unit, the UT-AA.
There might be a order 66 mission event that you have to research to unlock the order 66 units.