A
line of communication (or
communications) is the route that connects an operating
military unit with its
supply base. Supplies and reinforcements are transported along the line of communication. Therefore, a secure and open line of communication is vital for any military force to continue to operate effectively. Prior to the advent of the use of
telegraph and
radio in warfare, lines of communication were also the routes used by
despatch riders on horseback and runners to convey and deliver orders and battle updates to and from unit commanders and headquarters. Thus, a unit whose lines of communication were compromised was vulnerable to becoming isolated and defeated, as the means for requesting reinforcements and resupply is lost. The standard military abbreviation is LOC or SLOC for
Sea line of communication or ALOC for Air line of communication.