After several hours, I prepared for the returning fleet. Launched again and this time the target was destroyed.
Good luck rebuilding Markus.

Defender Markus
Destroyed!
The attacker has won the battle !
You receive 12.316.758 units of Metal, 1.504.595 units of Crystal and 1.674.044 units of Deuterium.
The attacker has lost a total of 0 units.
The defender has lost a total of 642.232.000 units.
A debris field containing 80.664.000 units of Metal and 47.850.000 units of Crystal has formed in orbit around the planet.
The probability of creating a moon is : 19 %
You collect; 80.664.000 units of Metal and 47.860.000 units of Crystal.