You control your units just like any other RTS game, but while they're moving around, performing the actions you've given them, you can turn yourself into a jetpack-equipped, firebreathing, unit-destroying dragon. You can combat other dragon commanders in this mode, you can even control your units to a slightly lesser extent, and lets not forget you can manipulate the way the battle unfolds with your dragon powers.
From being the annoying little untargetable bee, buzzing around a bigger unit and doing minor damage relentlessly, to destroying entire battalions in a second with devastating attacks, to mind-controlling enemy units and healing friendlies, your dragon is by far the most powerful unit on the battlefield. The controls are wonderful and intuitive, and with just a little practise (it took me all of one game to get the hang of it and thoroughly devastate the poor journalist I was placed against!) you can learn to be highly effective switching between full RTS control to maximise the effectiveness of your units, and being what is essentially a hero unit in third-person control.