The cessation of warfare before a treaty is signed

One word substitute is Armistice.

Affidavit: a written statement confirmed by oath or affirmation, for use as evidence in court.
Agreement: harmony or accordance in opinion or feeling.
Armistice: an agreement made by opposing sides in a war to stop fighting for a certain time; a truce.
Amnesty: an official pardon for people who have been convicted of political offences.