The truth is you can't get anyone to do what you want. You can try to make them do what you want but they're someone else in the end. Sir Walter Raleigh's beloved friend and lieutenant was Lawrence Kemys. When Raleigh was pardoned and sent back to find El Dorado, the conditions set were that he should not attack the Spaniards. He goes out to South America, and puts a detachment ashore led by his close friend and confidant - as aligned a person as you can imagine. Kemys attacks a Spanish outpost against express orders, gets Raleigh's son killed, returns to Raleigh to inform him of this, and promptly commits suicide. None of this is going to help Raleigh, though, because the conditions of his pardon now having been violated he is executed as promised.