The union general who commanded the army of the Potomac at Gettysburg used a technique to obtain buy-in. General mead began by asking his lower ranking and least experienced lieutenants to voice their opinions first he used this method because he knew if the more senior officer spoke first more junior officers in terms of rank reputation or experience might feel too intimidated to disagree. After everyone spoke mead decided the union would stay and fight a defensive battle  the rest as they say is history the union army was victorious and won the battle and would go on to win the war although it would take another bloody two years before the Confederate army laid down their arms.