Interior lines

[1] The term "interior lines" is commonly used to illustrate, describe, and analyze the various possible routes (lines) of logistics, supply, recon, approach, attack, evasion, maneuver, or retreat of armed forces.

[2][3] Skillful and comprehensive application of interior line tactics can, for a partially surrounded combat force, provide vital breathing space, greatly reduce time, effort, security, and secrecy of resupplies and redeployment, and decrease the number of casualties.

Resources are ideally brought to bear at a point where the adversary is not able to quickly respond, because of their longer external lines.

Examples include: As a strategy, interior lines are commonly employed to cut armies off from reinforcements and supplies, or prevent allies from uniting their forces.

Interior lines often allow for a numerically inferior force to gain a numerical superiority over an adversary in a given locality, which increases the chances of overpowering an enemy and defeating it in detail.

By September 1950, US and South Korean Forces had been forced back to form the Pusan Perimeter in the South-East of the peninsula , giving the defenders shorter interior lines. This created a concentration of forces in defense, allowing quicker reinforcements and logistics . Fresh troops and supplies were increasingly being brought into the port in Pusan , strengthening the defense even further and preventing a North Korean victory. By contrast, the North Korean supply line had lengthened, making offensive action harder to maintain.
Montenotte Campaign, Battle of Mondovì, 21 April 1796
After the Battle of Mondovi , the French gained the advantage of having the interior position over their adversaries in the First Coalition .