Basic training and rifle practice, along with teaching camp discipline, would have been preferable. When that was not possible, smaller fights, with a chance to retreat or advance, was the next best alternative. But throwing undisciplined soldiers into a large army camp and then forcing them to fight in big battles was bound to lead to high losses to disease and battle wounds.I don't disagree with your concept. But, the reality is that there was no basic training in the Civil War. Under Federal regulation troops could not be armed and uniformed until they were mustered into service. After they were mustered they were almost immediately shipped out from the camps where they had been assembled awaiting muster. IF they were lucky they went into camp in some rear area, like the fortifications around Washington, and got whatever on-the-job training their officers, who generally were also learning their jobs, were capable of giving them. Many went almost directly into combat, in many instances never having fired their weapons at a target or having fired their weapons at all. The Army learned a variety of lessons from the Civil War. That there needed to be some level of structured basic training as units were formed up was one of them.