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 Sewell's Point The Battle of Sewell's Point was an inconclusive exchange of cannon fire between the Union gunboat USS "Monticello", supported by the USS "Thomas Freeborn", and Confederate batteries on Sewell's Point that took place on May 18, 19 and 21, 1861, in Norfolk County, Virginia in the early days of the American Civil War. Little damage was done to either side. By the end of April 1861, USS "Cumberland" and a small number of supporting ships were enforcing the Union blockade of the southeastern Virginia ports at the southern end of the Chesapeake Bay and had captured several ships which attempted to pass the blockade. USS "Monticello's" bombardment of the Sewell's Point battery was one of the earliest Union Navy actions against Confederate forces during the Civil War. While it has been suggested by some sources that the "Monticello's" action may have been the first gunfire by the Union Navy during the Civil War, a brief exchange of cannon fire between the U.S. gunboat USS "Yankee" and shore batteries manned by Virginia volunteer forces which had not yet been incorporated into the Confederate States Army at Gloucester Point, Virginia on the York River occurred on May 7, 1861.