One clear example of a siege tactic used both by the Union army in the US Civil War and a siege tactic used by the Ancient Persians was the tunnel. When the Federals had Petersburg under siege for almost a year, one Union regiment came up with the idea of tunneling under the heavy fortifications of the city. This same tactic was used in ancient times among the Persians and other ancient armies.
a siege
a siege
Siege.
Siege.
Vicksburg.
a siege
The turning point was not a battle but a siege, the Siege of Vicksburg.
The only instance of Julius Caesar using the tactic of interior lines was at the siege of Alesia during the Gallic Wars
It's a siege tactic. Those laying siege would tunnel to the castle walls and destroy their foundations from under the ground. It was much safer than using a battering ram.
Siege of Petersburg
W. D. Pereira has written: 'The Siege of Gloucester' -- subject(s): English Civil War, Siege of Gloucester, Siege, 1643
ANSWER The Confederate forces laid first siege to Fort Sumter, starting the conflict.