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During the First World War every army unit had a group of pigeons   trained  .Many of them were   honoured  .Among them was an American pigeon with a French name Cher Ami,which meant"dear friend".A group of US soldiers were surrounded by the enemy.They had no food and no bullets.They nearly died of   hunger  .There was little hope for them.Cher Ami made his way   [MASK]   the bullets and succeeded.At once planes   set out   to drop food and ammunition   to them.With their strength   renewed  ,the soldiers fought back to their own army and got saved.