The Further Adventures of Robinson Crusoe by Daniel Defoe Chapter 9 Page 10

mark in that country not only of a truce and friendship, but when it is accepted the other side set up three poles or boughs, which is a signal that they accept the truce too; but then this is a known condition of the truce, that you are not to pass beyond their three poles towards them, nor they to come past your three poles or boughs towards you; so that you are perfectly secure within the three poles, and all the space between your poles and theirs is allowed like a market for free converse, traffic, and commerce.

When you go there you must not carry your weapons with you; and if they come into that space they stick up their javelins and lances all at the first poles, and come on unarmed; but if any violence is offered them, and the truce thereby broken, away they run to the poles, and lay hold of their weapons, and the truce is at an end.