Ok, say you were a king in the old testament and you were forced to go to battle. You have 400,000 men, and your opponent has 800,000. That's double your men if your not a math wiz. To make matters worse your soldiers were "seasoned warriors" aka old dudes, and the 800,000 you were up against were "courageous men from Israel". Personally I would run for the hills. King Abijah did not. In fact he thought the 800,000 Israelite's were crazy for wanting to attack him! Crazy! Why? Because he knew that God was on his side. He told the Israelite army this in 2 Chronicles 13:12 "So you see, God is with us. He is our leader. His priests blow their trumpets and lead us into battle against you. O people of Israel, don't not fight against the LORD, the God of your ancestors, for you will not succeed!"
Abijah knew and understood that because God was with him he could not lose no matter what the circumstance. The same still applies today. If God is on your side, and I assure you he is, we should have the same boldness and confidence that no circumstance can defeat us. God does not lose! So be full of faith, and confidence that what ever your battling against right now, you will be victorious, because God is fighting with you.