To a country, it holds that a military force may never leave its own borders except to move to the aid of someone else, and in such a situation, that it may protect from harm only if it is specifically invited to, with no aggressive action taken.
That does not apply if an aggressor remains an imminent threat upon retreat, as in the case of a gunman shooting a police officer and then fleeing into the public still armed.
In such cases, the assailant's "retreat" from the first scene still poses an imminent threat to the public, which gives defenders the right to pursue the threat and to use force to defend the public from further danger by apprehending the assailant or using any force that is necessary to mitigate the danger.
[3] They promoted a type of counteroffensive that does not inflict a decisive defeat on the enemy and is limited to one side's own territory.
[3] Some of the thinkers also favored defensive attrition warfare with limited war aims, as opposed to an objective of complete destruction.