Maus Quote on Chapter 3 book 1

I think that Valdek meant that he did something instead of just sitting around in the grass. To me Vladek was happy that he did something in the war to help, but at the same time he was shocked with the fact that he had taken a life. Even though he killed someone and was caught, he made a slight difference in the war rather than sitting there doing nothing. There are quite a few opinions on this at the site below. Check it out!