Why is it useful for historians to craft historical narrative

Historians have quest to know what happened in the past and so it's important to craft a narrative.

Explanation:

This is because a knowledge of what has happened in the past enables us understand the present and make insightful decision of preparedness for the future; hence its very important and a way to have access to information that happened in the past is from documentation.

a. poison gas was sprayed over battlefields by airplanes to weaken enemy positions before major attacks.

d. periodization. they used years or time lines with b.c. or b.c.e. or ad, ad being now, ex. 2018 is 2018 ad