What do you guys mean by "no losses"?

[CyberGuy]

I keep seeing a lot of threads about "no loss" this and "no loss" that. Does it mean that you guys go into battle without a single loss of unit throughout the game? I find this to be impossible. For instance, if you have 10 units of knights in your party and at the end of the battle encounter, you still have all 10 units and absolutely no single loss to any of your other units?

Or do you guys mean that "no loss" meaning that you don't lose the battle. Losing a battle means that you have to instantly start back at the castle where you are giving a certain number of troops and gold?