British admiral Lord David Beatty commanded a flotilla at the Battle of Jutland during World War I. As the battle began, British and German ships engaged each other long-range. A heavy cruiser, the Lion, was hit by an artillery barrage and quickly sunk. Next the Indefatigable was hit in its powder magazine and blown to pieces. Then the Queen Mary was sunk, taking a crew of 1,200 sailors straight to the bottom.

A flaw in the design of the British ships was soon recognized. Though their hulls were heavily armored, their wooden decks offered almost no protection against enemy artillery shells dropped from above. Only after the British began to armor their ships on top as well as on the sides did they stop losing ships to German long-range artillery.

Effective armor is a crucial element in spiritual warfare too. If you leave anything unprotected, the enemy will find a way to exploit that chink in your armor.