Possible Clues:

• Ukrainian peninsula, site of a 19th century war
• Church area round border in war zone
• Sea of Azov peninsula
• Illegal activity by first army in 1850s' war zone
• Sevastopol is its largest city
• Atrocity leading to a war scene
• Peninsula's edge is in mid-ocean
• Offence committed in front of a theatre of 17 14
• Ukrainian peninsula, scene of war
• Atrocity committed at a war zone?