How many troops in a confederate regiment?

Answer 1

On paper, an infantry regiment consisted of 10 Companies with 100 men in each for a total of 1000 men. This was a typical size of Union regiments when they were first formed and mustered into service. The Confederate regiments were not quite that size. Many didn't get to be that size as they were rushed into service.

After the regiment went off to war, they began to lose men in combat. The regiment was trimmed down even smaller. It was common for a Confederate infantry company to be 40 men. It was common for Confederate regiments to be as small as 250 men during the last 2 years of the war.

When the regiment experienced high loss of soldiers and officers, the regiment would be merged or "consolidated" with another regiment. Sometimes it was difficult to know this as they continued to be organized along their old regiment. Thus the 29th Mississippi Regiment and the 30th Mississippi Regiment in General Walthall's Brigade were merged into the 29th/30th Mississippi Regiment soon after the Battle of Missionary Ridge.