One of the great acts of courage in the Bible (and of course there are many) was displayed by Jonathan, King Saul's son in 1 Samuel, chapters 13-14. The Bible is full of courageous acts.
In 1 Samuel 13:5-7 we read, "And the Philistines gathered themselves together to fight with Israel, thirty thousand chariots, and six thousand horseman, and the people as the sand which is on the sea shore in multitude... When the men of Israel saw that they were in a strait, (for the people were distressed,) then the people did hide themselves in caves, and in thickets, and in rocks, and in high places, and in pits."
But in chapter 14 we read of how with great courage, Jonathan and his armor bearer discovered themselves to one of the Philistine garrisons. Jonathan spoke words of faith and courage when he said to his armor bearer: "Come, and let us go over unto the garrison of these uncircumcised: it may be that the Lord will work for us: for there is no restrain to the Lord to save by many or by few."
In that first encounter, Jonathan, with his armor bearer, slew about 20 men, then God took over. Remember that the only people in all Israel with sword and spear were Saul and Jonathan. Through the spiritual weapons God has given us, we can be like Jonathan. Through prayer (one of our greatest spiritual weapons), we can expose ourselves, slay about 20 devils, and just see what God can do with the rest!