When you have tech level 3... With VTOL, destroy long range defenses in enemy base (mortar, bombard, howitzer...), start destroying energy generator to stop oil production for a while. In this time, prepare a cyborg transport, 4 laser cyborg, 4 scourge cyborg and 2 repair cyborg. Send the transport and cyborgs near the enemy base (behind is better) and start destruction... For easier use create two groups with cyborgs: 1 with laser, the second with scourge.