The state of war between South Africa and Angola briefly ended Process_end with the short-lived Lusaka Accords , but resumed Process_start in August 1985 as both PLAN and UNITA took Getting advantage of the ceasefire to intensify Cause_change_of_strength their own guerrilla activity , leading to Causation a renewed phase of FAPLA combat operations culminating in the Battle of Cuito Cuanavale .