During World War I Leach commanded the 151st Field Artillery Regiment, 42nd Infantry Division, and took part in the battles at Champagne-Marne, Aisne-Marne, St. Mihiel, and Meuse-Argonne.
I Leach commanded the 151st Field Artillery Regiment. This was during World War. I took part in the battles at Champagne-Marne-Argonne. This was during World War. I took part in the battles at Champagne-Aisne-Marne-Argonne. This was during World War. I took part in the battles at Champagne-St. Mihiel-Argonne. This was during World War. I took part in the battles at Champagne-Meuse-Argonne. This was during World War. The 151st Field Artillery Regiment was 42nd Infantry Division.