Practice relating to Rule 66. Non-Hostile Contacts between the Parties to the Conflict
Switzerland’s Basic Military Manual (1987) provides: “Military commanders of both sides may, within the bounds of their authority, contact each other directly in their respective operation zones.”
Switzerland’s ABC of International Humanitarian Law (2009) states:
A ceasefire is an immediate halt or end to hostilities. This military concept refers to both agreements negotiated between the parties to a conflict and the unilateral termination of all military activity by one of the parties, possibly for a specified period of time or in a specified area.