Q
I lost the battle last turn, but I don't want to set 2 cards this turn.
A
A player who lost the previous turn may play up to 2 cards from their hand the next turn, but if you don't want to play 2, you can put just 1 card in the set zone. (You must always set at least 1.)
In this case you played 1 card from your hand, so you also draw 1 card from your deck at the end of the turn.