Fighting for love looks less like a battlefield and more like staying in a kitchen at eleven at night, after everything useful has been said, and not going upstairs.
The warrior image suggests enemies somewhere. Mostly the opposition is internal: your own pride, your preference for being right, the pull towards the easier silence.
Courage in a relationship is nearly always a matter of staying in the room. Anyone can leave a room well.
If there is a conversation you have managed to avoid for a fortnight, that is the fight. It will take twenty minutes and you will sleep better afterwards.