Making no headway at first, Union artillery was brought forward.

The basic unit of Union artillery was the battery, which usually consisted of six guns.

A section of Union artillery was brought into service against the Missourians' 12-pounder, which responded.

Union artillery placed on the heights west of town drove Stuart's force back up the turnpike.

Return fire scattered the Union artillery, however, and Sanders was forced to retreat.

Union artillery fired on the fort from positions across the river on January 11, and the infantry moved into position for an attack.

After a while, Union artillery came up and a series of counter-battery exchanges ensued.

When the main Confederate battle line advanced, it came under heavy fire from the Union artillery and was soon pinned down.

Union artillery opened fire and pickets were sent forward to meet the assault.

Harry's respect for the Union artillery, already high, increased yet further.