The Israelites, when taking possession of Canaan, struck fear into the hearts of their enemies even before the first city fell. They were familiar with what God had done for Israel and all knew that God was with them.
“and (Rahab) said to the men, 'I know that the Lord has given you this land, that the terror of you has fallen on us, and that all the inhabitants of the land are fainthearted because of you. For we have heard how the Lord dried up the water of the Red Sea for you when you came out of Egypt, and what you did to the two kings of the Amorites who were on the other side of the Jordan, Sihon and Og, whom you utterly destroyed. And as soon as we heard these things, our hearts melted; neither did there remain any courage in anyone because of you, for the Lord your God, He is God in heaven above and on the earth beneath.'” (Joshua 2:9-11)
Receiving Christ as Lord gives one the strength to strike fear into the heart of the inhabitants of the "land." God promises victory over the lusts of the flesh and the certain death that sin causes, but not without a fight.
A military campaign is won through strategy. As Joshua and his warriors tore through the land of Canaan, a pattern of military strategy emerges. The Israelites began with Jericho and moved through the highlands and mountainous regions of Canaan. Next, major Egyptian outposts and centers were targeted and destroyed. Efficiency comes through strategy.
In the lives Christians, forming a strategy to defeating enemies is crucial to daily victory. First, hit the areas of sin that are the easiest to destroy. Get off drugs, put off poisonous relationships and begin to serve in the church. Continuous wins occur when Christians begin to take out those enemy outposts. A consistent prayer life and Bible study are both habits that need to be formed and matured. An understanding of a personal role in God's covenant to believers will determine the outcome of any particular battle that comes their way.