Prior to this, guerrillas from the NPA's Front 21 figured in an encounter with a column from the 402nd DRC near the area where Paras was ambushed. All the NPA guerrillas were able to retreat safely although they left behind two rifles.
Bago ito, nakaengkwentro ng mga gerilya ng Front 21 ng BHB ang isang kolum ng 402nd DRC malapit sa lugar kung saan inambus si Paras. Ligtas na nakaatras ang lahat ng mga gerilya ng BHB bagamat nakaiwan sila ng dalawang riple.