Why would the "job" of being a leader change during war?

there is an expansion in abilities of the president during a wartime. the president gains many authorities that he would not have had prior. the president is commander in chief of the military first and foremost, and during a war, the focus of the president will likely shift off of other issues to focus on protection of the country.

the  seven  days  battles  were  a series of seven battles over seven  days from june 25 to july 1, 1862, near richmond, virginia,  during  the american civil war. the  seven  days ended with mcclellan's army in relative safety next to the james river, having suffered almost 16,000 casualtiesduring  the retreat.