That doesnt make sense.
If you say you need to win every battle or you go under, that implies that if you win 4 battles, then lose the 5th, you're screwed. However, that would mean your opponent lost 4 battles but still managed to come back.
In my experience it can be hard to push, even if you win a battle, due to many heavy weapons having a setup time. Often losers will fall back to a defensive position, winners will chase, and get tore up by heavy weaponry because they ran headfirst into it without stopping to set up their own heavy weaponry.