What did the Catholic Church sell that some of the people thought was wrong? What was the purpose?

In Catholic teachings, purgatory was a place where souls went to make up for their sins before they went to heaven. ... Many Christians thought that by selling indulgences, the church was letting people buy their way into heaven.

Explanation:

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.