About a mouse who wanted to be a soldier (or some synonym...I don't think it was soldier)? He had to go through three trials and ended up in the garden all night to prove he was brave. The repeated line was always "A mouse ______ is brave and true." (the blank being the titular word I don't remember). Any clues? Seriously, I can't find it anywhere.
Also, it's not Mouse Guard. This would have been published somewhere around 20 years ago.
Also, it's not Mouse Guard. This would have been published somewhere around 20 years ago.