6. In the course of the US Civil War, how did tactics change? O Massed groups of soldiers charged the enemy.
More of the responsibility was borne by the cavalry.
O Defensive trench warfare became more common.

On the Operational Strategic level (known at the time as Grand Tactics). The armies began to rely more and more on fortifying a position when they stopped movement. By the end of the war, soldiers, on their own initiative, began building primitive firing positions on their own.

Explanation:

:)

the correct answer is d

c. mass = force / accellaration

step-by-step explanation: