Because her shape, like a "cheese box on a raft", offered but little target to the adversary artillery, until she would have been engaged at a very close range.
The Union Ironclad ship was the Monitor. The Confederate ship was the Virginia.
Monitor
Did you know that a Swedish engineer designed the Monitor, an ironclad ship in the Civil War? A+
Monitor.
John Ericsson
Monitor
Monitor
The Monitor was an ironclad ship created by the Union to battle against the Confederate ironclad called the Virginia (Merrimack).
The first Ironclad ship ever made was by the northern states during the civil war was named the Monitor.
Ironclad.
The Merrimac(the south's ship) and the Monitor(the North's ship)
The Confederate ship was called the Merrimack and the Union ship was called the Monitor.