Can you over work bread dough?

Can you over work bread dough?

Yesterday, I made a batch of simple bread dough which I split in half to make two country style loaves. The first I fussed with because the score didn’t look perfect and kept working it to make perfect marks ( I know I know anal much?). That loaf ended up with a poor crumb and gummy middle while the other loaf (which I was satisfied with) turned out to be the best loaf of my life. My question is can you distroy bread dough by fussing with it too much or over kneading? 

Source: Fresh Loaf