Neutiquam means "by no means, not at all" Occidui is the masculine plural of occidus, the adjective meaning struck down.
Try "Non perdor, non occidi " [I am not a lost person ( literally 'I am not lost') I have not fallen/ did not fall] A person 'lost' on a battlefield is being euphemistically described; we mean he's been killed, lost to the world. Occido can mean to fall in the sense of to fall down, fall over. It also has a meaning of kill, strike down, which suits this falling.