[Suicide Junkie]

Being in control of the planet, VERY temporarily, that's a good idea...
But don't just space them.

Load up your transports with as many platforms as they can hold (if you're allowed up move cargo off the contested planet).

Then you can drop your reinforcements, AND not have to worry about losing. When you win, you can plop the platforms right back down to fight off your opponent's next wave of ships.