DEUT974 Anoint a Kohen to instruct and encourage Jewish soldiers. Key concept: It is known that in wartime, soldiers need a large dose of encouragement and strengthening. It also is known that people are more apt to heed words said by someone who is important, honored and respected. Therefore, the Torah commands that before battle, the soldiers be encouraged and strengthened by words from a member of our nation's most honored family—the Kohanim. As to why the Torah exempt from the army he who planted a vineyard but has not yet redeemed its fruits, or is betrothed to marry but the wedding still is pending etc. the reason is that thoughts of these matters preoccupy one's mind. Men in these situations cannot fully concentrate on the battle. As a result, they are poor fighters and will weaken the hearts of their fellows. Similarly, if someone is fearful because he has committed a sin, it is best to send him away before the fighting starts, because if he stays, his fellows, too, may suffer punishment for his sin.