 Complete the following phrase:  For much of its first two years, the 70th Indiana performed reconnaissance duty and guarded railroads in Kentucky and Tennessee. In 1864, Harrison and his regiment joined William T. Shermans Atlanta Campaign and moved to the front lines. On January 2, 1864, Harrison was promoted to command the 1st Brigade of the 1st Division of the XX Corps. He commanded the brigade at the battles of Resaca, Cassville, 