Lebanese Muslims believed the MNF, and the Americans in particular, were unfairly siding with the Maronite Christians in their attempt to dominate Lebanon.[27][28][29] As a result, this led to artillery, mortar, and small arms fire being directed at MNF peacekeepers by Muslim factions. Operating under the peacetime rules of engagement, MNF peacekeepers – primarily U.S. and French forces – used minimum use of force as possible in order to avoid compromising their neutral status.[30] Until October 23, 1983, there were ten guidelines issued for each U.S. Marine member of the MNF: