A new challenge end battle result - DRAW.
Battling “four tanks challenge” my ships fire upon the enemy and enemy is responding still no ships is damaged and or destroyed. This can long forever. Currently if I press escape I lose the battle although I have 96% to 75%. I would say this is a stalemate situation that could be considered as a draw.
I would say if for a certain time the percentage is not changed and values are over 50% then battle should be considered as a Draw.
Here is a screen of the battle after a long period on 4.0 speed: