It didn't really teach me to fight more. Rather, I had to find a different way of working with her rather than just getting ****ed off. The angrier I got, the angrier she got, which lead to broncing fits, bolting, and all sorts of unpleasant things. Taught me how to be a firm leader rather than getting in people's faces to get what I want. When someone criticizes me unjustly, for example, I will quietly and in a calm tone correct them. Not taking their crap, but also ending rather than instigating. Same with horses. My horse gets two chances to do what I ask, and then a swift snap with the dressage whip. She becomes more sensitive and quicker to respond every day, and I'm having to use my dressage whip less and less.
The other important thing I learned was when to give up and when to stick to it. I'm not a fan of giving up, but I have learned when to quit. ;)