Was Operation Diadem or the Battle of Cold Harbor fought during the Civil War?
Operation Diadem Operation Diadem, also referred to as the Fourth Battle of Monte Cassino or, in Canada, the Battle of the Liri Valley, was an offensive operation undertaken by the Allies of World War II (U.S. Fifth Army and British Eighth Army in May 1944, as part of the Italian Campaign of World War II. "Diadem" was supported by air attacks called Operation Strangle. The opposing force was the German 10th Army.
Battle of Pea Ridge The Battle of Pea Ridge (March 7–8, 1862) (also known as the Battle of Elkhorn Tavern) was a battle of the American Civil War. It was fought at Pea Ridge in northwest Arkansas, near Leetown. Union forces, led by Brigadier-General Samuel R. Curtis, moved south from central Missouri, driving Confederate forces into northwestern Arkansas. Major-General Earl Van Dorn launched a Confederate counter-offensive, hoping to recapture northern Arkansas and Missouri. Curtis held off the Confederate attack on the first day and drove Van Dorn's force off the field on the second. This Civil War battle, one of the few in which a Confederate army outnumbered its opponent, essentially established Union control of most of Missouri and northern Arkansas.