What was Hitler injured by in the First World War?

Yes. He was once wounded in the thigh by shrapnel and once temporarily blinded by poison gas. He later received the Iron Cross 1st Class and 2nd Class and a wound badge for his service.

Although Hitler was not a Prussian [he was Austrian], he was a decorated warrior who earned his 6 medals in WW1 - they were not just given to him. Hitler was a Corporal, and it was very rare for someone who was not an Officer to receive the Iron Cross First Class. [Interestingly, this Iron Cross was awarded on the recommendation of his officer who just happened to be jewish!] .