He had his fleet down in a time i know him to be offline, so I probed his planets and found it. Had plenty of time for the attack to go through, lost a little of the DF however, around 6 million total, as he did come online.

The attacker has won the battle !
You receive 2735500 units of Metal, 532026 units of Crystal and 417516 units of Deuterium.
The attacker has lost a total of 4.060.000 units.
The defender has lost a total of 243.882.950 units.
A debris field containing 77.286.870 units of Metal and 55.026.300 units of Crystal has formed in orbit around the planet.
The probability of creating a moon is : 19 %