Why is it important to honor timelines?

Around 160,000 Allied troops, 73,000 of whom were Americans, stormed the beaches of Normandy in a carefully coordinated attack. Before the invasion was over, an estimated 4,500 troops had lost their lives. Another 5,500 were listed as wounded or missing. German casualties topped 9,000.

Explanation:

Timelines are very important in any study of history, as they allow one to connect concepts temporally, i.e. that is to say, with respect to time.

what are the lines. come on!