Puritans press on the borders

• The Virginia and the Monitor, e.g.
• Cromwell's men
• Teams following smooth Commonwealth forces
• Old __: Cromwell's nickname
• Oliver Cromwell
• Bygone warship
• "Old ___"
• Cavalry is pressing round flank

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Ironside \I"ron*side`\, Ironsides \I"ron*sides`\, prop. n. A nickname for Oliver Cromwell. A nickname for Edmund II of England. --RHUD