Why were depth charges important during ww1?

To protect ports from possible enemy submarine attacks.

Explanation:

Short answer, Depth charges were used as weapons in the world war one

Explanation:

elongated answer, Depth charge, also called depth bomb, a type of weapon that is used by surface ships or aircraft to attack submerged submarines. The first depth charges were developed by the British in World War I for use against German submarines.

nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.

i think it's a)sparta