During the last tournament the devs changed something about the attack calculation to get rid of the rounding "unfairness". In some cases (maybe in all?) casualties are now rounded up instead of down like they always were. This leads to an exploit when attacking. Here's one of my attacks

Victorious battle against Giant Rats (NPCs)'s forces at Square 359|-572 by Innoble's forces from Milky Way

Cavalry comes into its own when able to strike hostile forces at will, and from unexpected directions - and nowhere is this more feasible than on open plains. Lightly armoured spear units, however, prefer terrain where there's some cover available.

Fighting defensively on open plains, cavalry draws strength from the ability to form and reform their lines of engagement depending on the direction of battle, and it is here where cavalry excels.

Attackers:	Unit:	Quantity:	Casualties:	Survivors:
Commander: Heavy I	Knight	1	Damaged for 99, 101 health remains.
Troops:	Charioteers	121	121	0
Commander: Heavy II	Knight	1	Damaged for 99, 101 health remains.
Commander: Heavy III	Knight	1	Damaged for 99, 101 health remains.
Commander: Heavy IV	Knight	1	Damaged for 99, 101 health remains.
Commander: Light	Charioteer	1	Damaged for 99, 101 health remains.

Defenders:	Unit:	Quantity:	Casualties:	Survivors:
Troops:	Ratlings	1139	1139	0
Troops:	Rats	1132	1132	0
Troops:	Diseased Rats	935	935	0
Troops:	Elder Bucks	703	703	0

Your victorious troops retrieved:
0 
from the slain foes.

As you can see it is a victory and all rats are dead. However, the army is also destroyed and all commanders are returned home instantly (ALIVE!). That means I can attack again right away. So now whereas I could only attack only one legion of rats on a day before, I can now attack two (provided I have the troops and want to spare the time searching). I doubt this is as intended.

NOTE: This has nothing to do with the defy death commander ability. That one only triggers when commanders die, usually when you lose. I got no such message and this report is only one of roughly 10 now. The trick works every time. Note also that the gold retrieved is 0. That makes sense since there are no troops available to carry. 

At first when I noticed this I just added 1 more troop to the calculation to make sure the army would not be destroyed, but then I realized it was more profitable to be destroyed and able to attack again.

Of course none of this helps you if you cannot calculate your hits precisely. B ut then some of us can. Do we really need another major advantage to add to that?