When did the concept of an officer as an expert soldier and educated leader emerge?

What are some tips for not eating at school? The twins will stay with their grandmother during the summer? What is the youngest person to have parkinsons disease? Which would be found in the anterior root of a thoracic spinal nerve? What body of water did Caesar cross to his campaign to Spain? Is Swine Flu bacterial or viral? What force cause air to move in an out of the lungs? Which bone cell types is primarily responsible for initiating ossification of a bone? What does it mean when they tell you your placenta is bruised a 9 weeks? What type of tissue is involved in a simple skin injury? Can carrot sometimes be toxic? How do you prevent panreadic cancer? The rapid detection test that assist in the diagnosis of stomach ulcers detect? When you breath a weird humming feeling is in your lower left body right below your rib cage? What are the effects of too much iron in the human body? Can you get pregnant from dry-sex if you had underwear and your boyfriend had basketball shorts on even though you are on birth control? Can alcohol wipes kill cdiff? What is the phobia of sewers called? Why is Sickle Cell Disease only found in the African race? How do the numerous air sacs that make up the lungs and the numerous filaments that make the gills help the organisms to take in oxygen?

When did the concept of an officer as an expert soldier and educated leader emerge?