Problems faced by the union army in the Battle of Shiloh?

During the Battle of Shiloh, the Union Army faced several significant challenges, including a lack of preparedness and underestimation of Confederate strength. Many Union troops were inexperienced and scattered, which hindered their ability to effectively coordinate defenses. The surprise attack by Confederate forces on the first day caught the Union off guard, resulting in heavy casualties and chaos. Additionally, logistical issues and poor communication compounded their difficulties during the intense fighting.