I love to collect Purple Heart groupings. Here is a grouping for a Purple Heart that was awarded for wounds obtained in 1918 during the Meuse-Argonne Offensive. The gentleman lost his right leg as a result. As you know the purple Heart was not available in WWI and had to be applied for after it was adopted by the US Congress in 1932. In this case, the award was sent out on December 28, 1943 (during WWII).
Here is a link to where Mr. Cowalski is buried: Clarence C Cowalski, Jr (1892 - 1957) - Find A Grave Memorial
First up is the paper and Purple Heart.