It depends on the values you've entered for the other parameters (morale, luck, flags etc).
I've tested with the following - flags - none, both defender and attacker - religious, Luck - 0, Morale - 100:
1st attack:
Attacker Units: 0 0 6000 0 0 3000 0 0 280 0 0 0 0 819.000 536.000 1.046.000 19.400
Losses: 0 0 6000 0 0 3000 0 0 280 0 0 0 0 819.000 536.000 1.046.000 19.400
Defender Units: 0 0 0 0 0 0 0 0 0 2000 1 0 0 640.020 800.020 200.040 16.010
Losses: 0 0 0 0 0 0 0 0 0 437 0 0 0 139.840 174.800 43.700 3.496
Damage by rams: The wall has been damaged and downgraded from level 20 to level 17
2nd attack :
Attacker Units: 0 0 6000 0 0 3000 0 0 280 0 0 0 0 819.000 536.000 1.046.000 19.400
Losses: 0 0 6000 0 0 3000 0 0 280 0 0 0 0 819.000 536.000 1.046.000 19.400
Defender Units: 0 0 0 0 0 0 0 0 0 1563 1 0 0 500.180 625.220 156.340 12.514
Losses: 0 0 0 0 0 0 0 0 0 522 0 0 0 167.040 208.800 52.200 4.176
Damage by rams: The wall has been damaged and downgraded from level 17 to level 12
With the same offensive strength (6k axe, 3k lcav, 280rams) the defender will lose more troops on each iteration (the wall and defense strength will be lower) as long as the initial parameters remain the same.
The second case may occur, if for example in the second attack you'll have a negative value for moral, let's say -25%. In this case, the consequences will be the following:
Attacker Units: 0 0 6000 0 0 3000 0 0 280 0 0 0 0 819.000 536.000 1.046.000 19.400
Losses: 0 0 6000 0 0 3000 0 0 280 0 0 0 0 819.000 536.000 1.046.000 19.400
Defender Units: 0 0 0 0 0 0 0 0 0 1563 1 0 0 500.180 625.220 156.340 12.514
Losses: 0 0 0 0 0 0 0 0 0 339 0 0 0 108.480 135.600 33.900 2.712
Damage by rams: The wall has been damaged and downgraded from level 17 to level 13
The defender will lose less troops comparing to the first attack, which is correct due to the fact that the moral is lower.
The battle results depends on the other factors, you shouldn't take into consideration just the troops you or the defender have.