Battle
They ran out if ammo
Their own unpreparedness. Neither Grant nor Sherman had thought there were any Confederates within striking distance. When the enemy attack came, half the Union divisions were not in place, and a big force under Buell had been delayed reaching the scene. The entire Union army was nearly pushed into the river. Only Beauregard's decision to suspend the operation, and dig in for the night, saved the Union army from total destruction.
The word reached them long before Union Troops arrived to enforce emancipation. They were free by law, but prisoners and slaves at the same moment in time.
Death from heat and vapours
They didn't know the terrain as well.
Battle
pizza
The troops hadn't been trained - as the army commander knew. The Union had not yet built-up an effective cavalry. Some of the enemy were wearing blue uniforms, which confused them.
To be quite frankly, they didn't have any problems. The Soviets were trained to deal with the harsh weater conditions they experianced and had a good logistical support sstem of food, ammo and tanks.
They ran out if ammo
Getting financing was his major problem in the beginning.
A large Union force in a superior defensive position…
survival hunger weather passages mapping
He had to face the World War I
They had to deal with bad weather, poor clothing, boredom, and hunger.
blocked the August Coup