Leaving an ACS Defend on any extended time is dangerous. Someone had put a small fleet on dinger's planet. I happened to find it when I was searching planets for wartime targets.

GLotR dinger (or to the owner of the fleet, whomever that may be)

The attacker has won the battle !
You receive 423.280 units of Metal, 249.842 units of Crystal and 64.711 units of Deuterium.
The attacker has lost a total of 0 units.
The defender has lost a total of 102.480.000 units.
A debris field containing 31.788.600 units of Metal and 26.282.700 units of Crystal has formed in orbit around the planet.